How To Get Big Arms: 15 Steps (with Pictures) - WikiHow

Skip to ContentQuizzes

• PRO Courses Hot Guides Tech Help Pro Expert Videos About wikiHow Pro Upgrade
• QUIZZES All Quizzes Hot Love Quizzes Personality Quizzes Trivia Quizzes Taylor Swift Quizzes
• EDIT Edit this Article
• EXPLORE Tech Help ProAbout UsRandom ArticleQuizzes Request a New ArticleCommunity DashboardTrendingForums Arts and EntertainmentArtworkBooksMoviesComputers and ElectronicsComputersPhone SkillsTechnology HacksHealthMen's HealthMental HealthWomen's HealthRelationshipsDatingLoveRelationship Issues Hobbies and CraftsCraftsDrawingGamesEducation & CommunicationCommunication SkillsPersonal DevelopmentStudyingPersonal Care and StyleFashionHair CarePersonal Hygiene Quizzes Love Quizzes Personality Quizzes Fun Games ForumsArts and EntertainmentFinance and BusinessHome and Garden Relationship QuizzesCars & Other VehiclesFood and EntertainingPersonal Care and Style Sports and FitnessComputers and ElectronicsHealthPets and Animals TravelEducation & CommunicationHobbies and CraftsPhilosophy and Religion Work WorldFamily LifeHolidays and TraditionsRelationships Youth
• LOG IN

  Log in

  Social login does not work in incognito and private browsers. Please log in with your username or email to continue. Facebook Google wikiHow Account No account yet? Create an account
• RANDOM

• Home
• Random
• Browse Articles
• TrendingNew
• Quizzes & Games
• All QuizzesHot
• Love Quizzes
• Personality Quizzes
• Fun Games
• Dating Simulator
• Learn Something New
• Forums
• Courses
• Happiness Hub
• Explore More
• Support wikiHow
• About wikiHow

• Log in / Sign up

Terms of Use wikiHow is where trusted research and expert knowledge come together. Learn why people trust wikiHow

• Categories
• Sports and Fitness
• Personal Fitness
• Building Muscle & Strength

The 6 Best Exercises to Build Bigger Arms Download Article Plus expert guidance on the best ways to build arm muscle Co-authored by Steve Horney PT, MPT, MTC, CSCS

Last Updated: May 26, 2025 Fact Checked

Download Article

• Targeted Exercises to Workout Arms
|
• Compound Exercises
|
• Lifestyle Changes
|
• Workout Basics
|
• How Do You Build Arm Muscle?
|
• Sample Exercises and Routines
|
• Video
|
• Expert Q&A

|Show more |Show less X

This article was co-authored by Steve Horney PT, MPT, MTC, CSCS. Steve Horney is a Licensed Physical Therapist and the Owner of Integrated Health Sciences, a New York City-based company that provides continuing education, health care products, and manual and movement physical therapy. Steve has over 15 years of academic and professional physical therapy training and specializes in the assessment and treatment of athletes with the goal of helping them become pain-free and less susceptible to injury. Steve is also a certified strength and conditioning specialist (CSCS) from the National Strength and Conditioning Association (NSCA). He received a BS in Health Science from Quinnipiac University in 2004 and a Masters of Physical Therapy (MPT) from Quinnipiac University in 2006. He then completed his Manual Therapy Certification (MTC) from the University of St. Augustine in 2014. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 2,117,288 times.

Large, muscular arms make you look strong and fit while giving your body a sculpted appearance. As an added bonus, having bulky arms may be able to help you perform impressive tasks like lifting heavy furniture and pushing stalled cars to safety without breaking a sweat. After doing exercises that cause arm hypertrophy, or muscle growth, it is also important to build strength in your back, chest, and shoulders as well.[1] Read on to learn what exercises and lifestyle habits build arm mass.

How to Get Big Arms

1. Bicep curls
2. Triceps extensions
3. Wrist curls
4. Bicep curls to shoulder press
5. Chin-ups
6. Push-ups

Steps

Part 1 Part 1 of 4:

Targeted Exercises

Download Article

1. 1 Perform bicep curls. Bicep curls work out the muscles in your upper arm. Hold a dumbbell in each hand with your arms straight. Curl the dumbbells up towards your shoulders. Pause briefly and lower them again.
   • Do two or three sets of 8-12 repetitions.
2. 2 Do triceps dumbbell extensions to bulk up your triceps. Stand with your feet shoulder-width apart and hold dumbbells over your head with your wrists facing inward. Lower the dumbbells behind your head so that your elbows point up in the air, then raise the dumbbells above your head and straighten your elbows again.[2]
   • Do between 8 and 12 reps, and 3 to 5 sets.

   Note: This exercise can also be performed using both hands to lower and extend one dumbbell above the head.

   Advertisement
3. 3 Do wrist curls to work out your forearms. It is important that you do not neglect your forearms. Wrist curls can help strengthen your wrists and forearms, which will improve your lifting ability overall. To do wrist curls, sit and grasp a dumbbell in each hand. Rest your arms against your thighs with your wrists hanging off the edge of your knees. Curl your wrists up and back down, keeping your forearms still.[3]
   • Repeat 8-12 times. Do two or three sets total.
Advertisement

Part 2 Part 2 of 4:

Compound Exercises

Download Article

1. 1 Do bicep curls to shoulder press to build your biceps and shoulders.[4] Your biceps are one of the main muscle groups in your arms, and working out your shoulders will help increase your overall body strength. Stand with your feet shoulder-width apart and hold the dumbbells at your sides with your arms fully extended and your palms turned inwards, curl the dumbbells to your chest, then press them over your head before reversing the dumbbells to the starting position.
   • Do between 8 and 12 reps, and 3 to 5 sets. Rest for about 45 seconds between sets.
   • This exercise may also be performed with a kettle bell or barbells.
2. 2 Do chin-ups to work out your biceps and back. The primary muscles that chin ups engage are in the back, but this exercise also helps strengthen your biceps. Grip a fixed bar with your hands shoulder-width apart and your palms facing you. Use your arms to lift your body, until your chin is higher than the bar then slowly lower yourself back to the starting position.[5]
   • Do between 8 and 12 reps, and 4 to 5 sets.

   Tip: You can increase the difficulty of this exercise by using a weighted belt.

3. 3 Perform push-ups. Push-ups are a great exercise because they target the chest, back, and ab muscles while also working out the arms.[6] To do a push up, put your hands below your body and slightly outside your shoulders. The rest of your body should extend straight back. Lower yourself by bending your elbows until you are just above the ground. Raise yourself back up until your arms are straight.
   • Do as many push ups as you can while still maintaining proper form.
Advertisement

Part 3 Part 3 of 4:

Lifestyle Changes

Download Article

1. 1 Don't eat too many calories. You may think that to bulk up your muscles, you should eat more calories than you usually would. Eating more calories doesn't translate into building bigger muscles. Rather, the calories increase body fat, which obscures muscle definition. The key is to eat a diet that enables you to be lean, so your big muscles become more apparent.
   • Eat balanced meals with plenty of fruits and vegetables, whole grains, healthy fats, and lean meats.
   • Avoid white sugar and flour, fried foods, and other high-calorie foods that may cause you to gain fat.
2. 2 Eat plenty of protein. Protein helps build muscles, so when you're trying to bulk up, it should be a mainstay of your diet. Try to increase your daily intake of protein to help build more muscle.
   • Choose fish, chicken, lean beef, pork, and other types of meat to supply yourself with protein. Eggs are also a great source of protein.
   • Beans, nuts, and other vegetables are good vegetarian protein sources.
   • Dairy, such as milk, cottage cheese, and yogurt, is another great source of protein.

   Tip: Consider supplementing your diet with protein powder such as whey. Whey is a byproduct of cheese that helps build bigger muscles.

3. 3 Take rest seriously. When it comes to building muscles, resting periods are as important as workout periods. Get between 7 and 9 hours of sleep on the days when you work out, and avoid overdoing it with other activities that require use of your arm muscles.
   • You're probably working out your muscles enough if they burn while you're at the gym. However, if your arms keep burning long after you leave, that's a sign you're stressing your muscles too much, which can actually slow down the process of your arm muscles growing.[7]
Advertisement

Part 4 Part 4 of 4:

Workout Basics

Download Article

1. 1 Work out your whole body. It's healthier to strengthen all of your muscles with compound exercises than to focus only on building arm mass. If you want to be able to lift heavy objects and weights, you also need to work on your shoulders, chest, and back. If you don't work out your legs and core, you'll end up with big arms and a lower body that isn't as muscular.[8]
   • Do compound exercises that bulk up your arms while also toning other muscles. Chin-ups and push-ups, for example, strengthen your abs at the same time they are strengthening your arms.
   • Reader Poll: We asked 679 wikiHow readers what type of exercise they enjoy the most during arm workouts, and 73% said weightlifting. [Take Poll]

   Tip: On the days when you aren't training your arms, train other muscle groups in your legs, back and abdomen. This way you'll still be building strength while your arm muscles are recovering.

2. 2 Train two times per week. Many people think that working out every day builds bigger muscles, but muscle mass is actually built during resting days between workout sessions. Your muscles grow stronger as they recover between lifting sessions, enabling you to gradually lift more and more weight. If you don't give your muscles time to rest, particularly your arm muscles, you risk overtraining them and delaying the results you want to achieve.
3. 3 Train in 30-minute sessions. For the same reason, you should only train one or two times per week and each training session should only last about half an hour. Training for over half an hour per session greatly increases the risk that you will injure your ligaments, joints, and tendons. Short, intense training sessions are your best bet for building arm mass.
4. 4 Train as hard as you can. Choose heavy weights that you are able to pick up, and make your training sessions as high-intensity as possible. Muscle-builders call this "training to failure," because it means lifting weights that are heavy enough to cause you to "fail," or be unable to complete the exercise after five to eight reps. As your arms grow stronger, and you find that the weight you've been lifting is no longer as difficult, add more weight.
   • If you are new to lifting weights, you may want to work with lower weights first before working your way up to heavier weights. Do not start off with the heaviest weights you can lift. Instead, find a lighter weight that you can do at least 8-12 reps with.
   • Find your "train to failure" weight by experimenting with different weights until you find one you can lift several times before breaking a sweat and feeling you can't lift it again. If you can complete 10 or 12 reps without sweating or feeling much of a burn, you should be lifting more weight. If you can't complete five or six reps before giving up, decrease the weight.
   • While extreme discomfort is part of building muscle mass, you shouldn't be lifting so much weight that you feel you're going to be sick or pass out. There's no shame in starting at a lower weight. Start lifting a weight you can handle, and soon you'll build up the strength required to lift heavier weights.
   EXPERT TIP

   Laila Ajani

   Fitness Trainer Laila Ajani is a Fitness Trainer and founder of Push Personal Fitness, a personal training organization based in the San Francisco Bay Area. With over 13 years as a trainer and exercise specialist, Laila has expertise in competitive athletics (gymnastics, powerlifting, and tennis), personal training, distance running, and Olympic lifting. Laila is certified by the National Strength & Conditioning Association (NSCA), and USA Powerlifting (USAPL), and she is a Corrective Exercise Specialist (CES). Laila Ajani Fitness Trainer

   Gradually increasing the weights you lift in the gym will help keep you motivated. For each exercise, start with a weight you can handle for three sets of 4-8 reps, then increase the weight for the next workout while keeping the same routine. People become addicted to strength training because they enjoy tracking their progress and seeing their numbers increase.

5. 5 Do high-volume workouts, low-intensity workouts. Instead of doing exercises with the maximum amount of weight you can handle for a few repetitions, choose a smaller weight and do more repetitions. High-volume workouts are associated with more muscle growth and are used by bodybuilders to gain muscle mass quickly.[9]
   • For example, you could do 8 dumbbell curls at 50% of your maximum weight. This would be one rep. Then you could repeat this 5 or 6 times in a workout.
6. 6 Use proper form. Get the maximum benefit from your workouts and avoid injury by using the correct form when you lift weights. In addition, to lifting the appropriate amount of weight for your level of fitness, keep the following tips in mind when you're lifting weights:
   • Lift with controlled movements, rather than using momentum to move the weights.
   • Be sure you are able to complete each full exercise for at least 6-8 reps. If you cannot do this many, the weights you are using may be too heavy.
Advertisement

How Do You Build Arm Muscle?

Sample Exercises and Routines

Exercises to Get Big Arms Beginner Exercise Routine for Bigger Arms Intermediate Exercise Routine for Bigger Arms

Expert Q&A

Search Add New Question

• Question How long will it take my muscles to grow if I do 30 to 60 reps with 20lbs a day? Michele Dolan Certified Fitness Trainer Michele Dolan is a Fitness Trainer based in Sidney, British Columbia. She has been a personal trainer and fitness instructor since 2002, and was certified as a Personal Trainer by the British Columbia Recreation and Parks Association (BCRPA). Michele is also a Registered Clinical Counselor, and uses her 20+ years of fitness coaching experience to help clients understand their mind-body connection. She is a Registered Clinical Counsellor (RCC) and Certified Clinical Counsellor (CCC), certified by the British Columbia Association of Clinical Counsellors and the Canadian Counselling and Psychotherapy Association. In her work, Michele uses the tools of Cognitive Behavioral Therapy, Dialectic Behavior Therapy and Cognitive Processing Therapy for Post Traumatic Stress Syndrome. She practices and teaches mindfulness and acceptance in all of her coaching work. She holds a Master’s Degree in Counselling Psychology. Michele Dolan Certified Fitness Trainer Expert Answer Building muscle requires constantly challenging the muscle with increasing weight. Perform 3-5 sets of 6-10 repetitions twice per week. Use weight that is the heaviest you can lift with good technique. You can expect to see results in 6-8 weeks. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 19 Helpful 73
• Question Should you do push-ups everyday or the same as a regular workout? Michele Dolan Certified Fitness Trainer Michele Dolan is a Fitness Trainer based in Sidney, British Columbia. She has been a personal trainer and fitness instructor since 2002, and was certified as a Personal Trainer by the British Columbia Recreation and Parks Association (BCRPA). Michele is also a Registered Clinical Counselor, and uses her 20+ years of fitness coaching experience to help clients understand their mind-body connection. She is a Registered Clinical Counsellor (RCC) and Certified Clinical Counsellor (CCC), certified by the British Columbia Association of Clinical Counsellors and the Canadian Counselling and Psychotherapy Association. In her work, Michele uses the tools of Cognitive Behavioral Therapy, Dialectic Behavior Therapy and Cognitive Processing Therapy for Post Traumatic Stress Syndrome. She practices and teaches mindfulness and acceptance in all of her coaching work. She holds a Master’s Degree in Counselling Psychology. Michele Dolan Certified Fitness Trainer Expert Answer No. Perform push-ups two to three times per week to get the greatest muscle gain. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 24 Helpful 93

Ask a Question 200 characters left Include your email address to get a message when this question is answered. Submit Advertisement

Video

Reader Videos

Tips

• You won't break strength records with 4 hours of sleep Thanks Helpful 22 Not Helpful 6
• Always stretch before and after a workout. You could injure yourself if you don't. Warming up allows your muscles to fatigue faster. Thanks Helpful 16 Not Helpful 5
• A smart and near effortless way to work out your arms and build some muscle is by tossing a medicine ball around. By simply juggling your medicine ball with your hands as if you're playing with it, you can exercise for several minutes in a row without tiring yourself, depending on how heavy it is. It's a kind of distraction/exercise you can do at home while watching TV, for example. Thanks Helpful 13 Not Helpful 3

Show More Tips

Tips from our Readers

The advice in this section is based on the lived experiences of wikiHow readers like you. If you have a helpful tip you’d like to share on wikiHow, please submit it in the field below.

• If you find it hard to do a push up, then do the same motions but with your knees on the ground. Eventually you can work your way up to a full push up.
• Don't give up! Exercise goals don't happen overnight, so keep going and stay consistent with your workouts.

Submit a Tip All tip submissions are carefully reviewed before being published Name Please provide your name and last initial Submit Thanks for submitting a tip for review! Advertisement

Warnings

• Know the difference between "good pain" and "bad pain", if you are finding pain when working hard and are still able to keep lifting even though it hurts, that's a good hurt. If It is painful to the point where you can't do any more reps etc., stop, rest, and come up with what could be the problem, don't push through the bad pain, it could lead to further injury. Thanks Helpful 25 Not Helpful 4
• Avoid steroids, as it messes up your body, inside and out. Thanks Helpful 34 Not Helpful 10

Advertisement

You Might Also Like

How to Build Bigger Biceps at Home (According to the Experts) How toMake Your Arms Thicker How toBuild Arms Fast How toGet Big Muscles Using Dumbbells How toGrow Your Biceps Fast How to Strengthen and Grow Weak Muscles How toGain More Muscle Mass and Strength How toGet a Bigger Upper Body How toGet Cut Arms How toGet Skinny Arms How toGet Strong How toBuild Upper Body Strength The Ultimate Guide to Building Muscle Mass How toGain Muscle Fast Advertisement

References

1. ↑ Steve Horney PT, MPT, MTC, CSCS. Licensed Physical Therapist. Expert Interview
2. ↑ https://www.coachmag.co.uk/tricep-exercises/6053/how-to-do-an-overhead-dumbbell-tricep-extension
3. ↑ https://www.youtube.com/watch?v=3VLTzIrnb5g
4. ↑ http://www.menshealth.co.uk/building-muscle/three-moves-to-bulk-up-your-arms
5. ↑ http://www.menshealth.co.uk/building-muscle/three-moves-to-bulk-up-your-arms
6. ↑ https://www.goodrx.com/well-being/movement-exercise/benefits-of-push-ups?srsltid=AfmBOoqPUXbvXtdi8LTEUegaJMmBXyVhFFnuAqG-wxvbHME0sVaKDie7
7. ↑ Steve Horney PT, MPT, MTC, CSCS. Licensed Physical Therapist. Expert Interview
8. ↑ http://www.menshealth.co.uk/building-muscle/three-moves-to-bulk-up-your-arms
9. ↑ Steve Horney PT, MPT, MTC, CSCS. Licensed Physical Therapist. Expert Interview

About This Article

Co-authored by: Steve Horney PT, MPT, MTC, CSCS Licensed Physical Therapist This article was co-authored by Steve Horney PT, MPT, MTC, CSCS. Steve Horney is a Licensed Physical Therapist and the Owner of Integrated Health Sciences, a New York City-based company that provides continuing education, health care products, and manual and movement physical therapy. Steve has over 15 years of academic and professional physical therapy training and specializes in the assessment and treatment of athletes with the goal of helping them become pain-free and less susceptible to injury. Steve is also a certified strength and conditioning specialist (CSCS) from the National Strength and Conditioning Association (NSCA). He received a BS in Health Science from Quinnipiac University in 2004 and a Masters of Physical Therapy (MPT) from Quinnipiac University in 2006. He then completed his Manual Therapy Certification (MTC) from the University of St. Augustine in 2014. This article has been viewed 2,117,288 times. 52 votes - 77% Co-authors: 71 Updated: May 26, 2025 Views: 2,117,288 Categories: Building Muscle & Strength Article SummaryX

To get bigger arms, dedicate half an hour, twice a week, to targeted exercises. Though you may feel tempted to do more, limit yourself to this type of schedule to avoid overuse injuries. For upper arms, work on bicep curls and triceps dumbbell extensions. To work on your forearms, try wrist curls. If you want to do a compound move to strengthen two areas at once, try a bicep curl into a shoulder press. Chin ups will help build bicep and back strength. Additionally, push ups are a full body workout that can strengthen your arms, back, and core. To learn more from our Personal Trainer co-author about how to change your diet to get bigger arms, keep reading the article! Did this summary help you?YesNo

In other languages Spanish Italian German French Portuguese Russian Chinese Dutch Indonesian Korean Arabic Thai Vietnamese Japanese Hindi Czech

• Print
• Send fan mail to authors

Thanks to all authors for creating a page that has been read 2,117,288 times.

Reader Success Stories

• 

  Amariliz Tan

  Sep 4, 2017

  "The 4 parts, especially the community Q&A, help me a lot. I think Michele Dolan's down-to-earth and..." more

More reader stories Hide reader stories Share your story

Did this article help you?

Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Co-authored by: Steve Horney PT, MPT, MTC, CSCS Licensed Physical Therapist 52 votes - 77% Click a star to vote Co-authors: 71 Updated: May 26, 2025 Views: 2,117,288

Amariliz Tan

Sep 4, 2017

"The 4 parts, especially the community Q&A, help me a lot. I think Michele Dolan's down-to-earth and..." more

Anonymous

Jun 13, 2018

"I now know that I have to train different muscle groups every day so that other muscles get to rest and recover for..." more

Jonathan Eaglin

Sep 27, 2017

"Very educational because I'm over weight and have diabetes, type 2, so this helped me a lot, thanks!"

Don

Apr 25, 2018

"Now I know how to do exercise per week and increase my knowledge on how to build biceps muscles!"

Ryan Lombardi

Jul 7, 2016

"It took about a month and a half, and I can already see a huge difference." Share yours! More success stories Hide success stories

Quizzes & Games

What Beginner Workout Should I Try QuizTake QuizWhich Diet Is Right for Me QuizTake QuizWhat's the Best Meal Kit for Me QuizTake QuizWhat Do I Want in a Weight Loss Program QuizTake QuizWhen Will I Die QuizTake QuizWhat's My Body Type QuizTake Quiz

You Might Also Like

How to Build Bigger Biceps at Home (According to the Experts)How toMake Your Arms ThickerHow toBuild Arms FastHow toGet Big Muscles Using Dumbbells

Featured Articles

What Are the Korean Animal Face Types? (And Which Type Do You Have?)Being the Little Spoon While Cuddling: Is It Better Than the Big Spoon?115+ Funny “Get Well Soon” Messages to Make Someone Laugh110+ “Fun Facts” for Interviews, Introductions, & IcebreakersHow Long Would You Survive In A Zombie Apocalypse?How to Roast Someone in a Rap Battle (Plus the Best Bars of All Time)

Trending Articles

How toMake OutWhat Song Was #1 On My Birthday?How Many People Had a Crush on Me This Year? Find Out HereBest Personality TestDo I Have Common Sense QuizDaily Horoscope (All Signs): What Do The Stars Predict Today?✩⟡˚₊‧

Featured Articles

What Turns a Girl On? 31 Things to Try on Your PartnerLove AnalyzerSending Your Sweetie a Love Note? Here are 200+ Romantic IdeasHow toExercise Your BrainHow toBe a Fun Person to Hang out WithWhat Does Your Morning Routine Say About You?

Featured Articles

How toDevelop Productive HabitsHow toPractice Self CareWhat Song Matches Your Life Right Now?Your 2026 Vision: What Does Next Year Hold?Understanding the Most Attractive Face Shapes (& Determining Your Own)Type A B C D Personality Test

Watch Articles

How to Deep Clean Your Kitchen Sink (& Keep It Clean)How to Curl Your Hair: 8 Easy & Quick WaysHow toThicken Sauce with FlourHow to Brighten Up White Shirts and Other GarmentsHow to Cook White Rice without a Rice CookerHow to Clean Out the Inside of a Glass Bottle (With or Without a Brush)

Trending Articles

Compatibility TestWhat Am I Craving Quiz150 Unique & Sentimental Ways to Say “Happy New Year”30+ New Year’s Eve Games to Keep Your NYE Party GoingWhich Hogwarts House Do You Truly Belong In?Toxic Family Test

Quizzes & Games

How Tall Will I Be QuizTake QuizWhy Am I So Tired QuizTake QuizHow Strong Am ITake QuizAm I Healthy QuizTake QuizWhich Male Body Type Do I Have QuizTake QuizHow You Can Discover HappinessTake Quiz

• Categories
• Sports and Fitness
• Personal Fitness
• Building Muscle & Strength

wikiHow Newsletter You're all set! Helpful how-tos delivered toyour inbox every week! Sign me up! By signing up you are agreeing to receive emails according to our privacy policy.

• Home
• About wikiHow
• Experts
• Jobs
• Contact Us
• Site Map
• Terms of Use
• Privacy Policy
• Do Not Sell or Share My Info
• Not Selling Info
• Contribute

Follow Us

×

wikiHow Tech Help Pro:

Level up your tech skills and stay ahead of the curve

Let's go! X --611