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Home » IDEA Answers » Why is my left bicep bigger than my right?
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Question asked by Gus Aguirre 211 days ago

Why is my left bicep bigger than my right?

BodybuildingWeight Training

Okay so I was doing a little fun flexing the other night in front of the mirror and I noticed my left bicep is bigger than my right! Not by a lot but I can definitely tell the difference. I use both dumbbells and barbells and try to focus my form all the time and I am right handed.

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Answered by Danielle Vindez 211 days ago
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255 Questions Answered, 1 Questions Asked
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Hello Gus
We are not completely symmetrical. Muscular size is a function of use. My left bicep is definitely larger than my right, but I am left side dominant. I would be curious to know what exercises, ADL, or other past impressions that one bicep may have experienced differently than the other? There could also be a genetic influence. If it is a concern, what would you suggest to a client in the same situation, assuming they wanted to cause a change?
Danielle
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Answered by Shawn Fears 206 days ago
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532 Questions Answered, 7 Questions Asked
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I have answered this question many times. when you are carrying the groceries in the house and you have to unlock the door what hand is using the keys and which is holding all the weight? You will favor your right hand for fine motor skill functions and your left hand for less motor skill function and more holding of things. It is very common for right handed people to have bigger left biceps and vice versa.
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Answered by Karin Singleton 206 days ago
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In addition to the suggestions already given, the key may lie in an activity a long time past. I used to play Squash with a passion, and while I have not touched a racket in 20 years, there is still a discernible difference between my right and left forearms.
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Answered by Mark Panveno 181 days ago
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sometimes an injury or tendonitis can cause one side to be bigger then the other because you cant recrute the same muscle fibers when lifting.
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Answered by Marlan Eller 210 days ago
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It's impossible to say for sure. If you're interested in fixing the "issue," then just train normally and don't favor the "smaller" side. If you train normally, your body will compensate for the imbalance as best it can. Don't take normally the wrong way, by saying normal I just mean that it's usually best to train bilaterally (barbell curls instead of isolation curls for example) when trying to correct a muscular imbalance. I'm not a corrective exercise specialist, so I encourage you to do plenty of research on your own. Just do the best you can, mix your program up, use proper form, pay attention to the proper strength ratios for your muscles, and don't work the "weaker" muscles more than the "stronger" muscles to make up for the imbalance and you should be fine regardless of the size of your muscles. I don't know your whole program, so everything I've said is just assuming that you're perfectly healthy.

It sounds like it shouldn't be much of a bother other than aesthetics. Danielle was correct in that no one is perfectly symmetrical. I'm right-handed and my upper left arm is 16 inches and my upper right arm is about 15.7 inches. My right forearm is larger than my left forearm but not by much. Your muscles are probably a lot more noticeable to you than to others. I'm that way a lot. I see myself so often that I notice all the small flaws, but the small stuff isn't noticeable to everyone else, they aren't looking that hard.
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