Considering we use our dominant arm for lifting, most tasks, holding things, etc.
In: Biology
Muscles grow due to volume of challenging work. High volume but no challenge = no growth, very low volume but high challenge = no growth, so squeezing a piece of paper 100 times won’t make you grow, but lifting something really heavy once a week won’t make you grow. It’s why body builders are often recommended to work out a muscle twice a week for 6-10 sets each time for 8-12 reps, and to usually work to near failure in each set. However, most things you do with your dominant hand aren’t difficult at all, like holding a pen, steering a car, or opening a door handle. Plus, your hand is controlled by muscles in your forearm, not your bicep, and your bicep usually doesn’t get fully stressed in daily movements, even if you are highly active.
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