Assume you have a 10-lb weight in your right hand. explain why it is easier to flex the right elbow when your forearm is supinated than when it is pronated.
Supinated would be your palm is up; so flexing your elbow up in order to lift the weight is a natural way that you flex your elbow.
How Does the position of the forearm affect elbow flexion?
In the erect position, subjects showed the greatest strength of elbow flexion.
As measured by a strain gauge dynamometer, with the forearm in the mid position, the least in the pronated position, and intermediate in the supinated position.
Thus, Supinated would be your palm is up; so flexing your elbow up in order to lift the weight is a natural way that you flex your elbow.
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