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It seems to me that my forearm is naturally in a more pronated position than the anatomic (supinated) position and that it actually takes work to make it hold the supinated position. Anyone an expert in human anatomy/physiology here or know of any sources that could point towards a more scientific answer?

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The main reason why the anatomic position is supinated is because the radius and ulna are crossed when the arm is pronated and parallel when the arm is supinated. It doesn't have anything to do with the resting state of the arm, it's just the easiest way to arrange the bones neatly for description and analysis.

Arm pronated and supinated

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  • $\begingroup$ I agree with the above answer. Also, we all tend to use our forearm more in the pronated form (holding, hand shake, driving, etc) so I guess it becomes second nature to us. $\endgroup$ – John_dydx Sep 2 '13 at 11:36

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