Arm size and muscle?


Question:
i have a medium arm size for a 16 year old. when its relaxed u can see small cuts. but when i flex my whole arm my triceps and deltoid get really big.

i noticed that big people have big muscles. but my arm is medium but it gets really big. what does this mean? i work out on a bowflex. thanks

Answers:
Biceps, when "flexed", tend to greatly increase in size. Yours appear much larger because more of the "inner" muscle mass is contracting.
You have a low bodyfat
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