Considering we use our dominant arm for lifting, most tasks, holding things, etc.
In: Biology
People often do have more developed dominant sides, but the difference is typically slight enough that you cannot easily tell without measuring tape. That’s because your body wants to conserve resources and avoid starvation, therefore it will not commit resources to growing bigger or stronger unless it experiences taxing stimulus that convinces the body that it is worth it to get stronger and be less vulnerable/avoid getting overloaded in the future. The result is that serious hypertrophy (muscle growth) is reserved for draining movements that typically employ multiple muscle groups rather than repetitive tasks like brushing your teeth or writing your name which are unilateral but are experienced at too low of an intensity to trigger a hypertrophic adaptive response. People who do engage in strenuous activities that only engage one limb or side of the body actually can develop disproportionately sized musculature such as in the case of baseball pitchers who train until they can throw 90+ mile per hour fastballs or experienced archers who train to use bows with heavy draw weights.
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