"Pull-ups" are easier to do with the hands supinated than with the hands pronated. An explanation for this is
A) the biceps brachii is attached to the radial tuberosity.
B) the biceps brachii supinates the forearm.
C) if the forearm is pronated, the biceps brachii is ineffective in flexing the forearm.
D) the brachialis is a much smaller muscle than the biceps brachii.
E) All of these contribute to a full and proper explanation.

Question

Quizplus · Accepted Answer

The biceps brachii is attached to the radial tuberosity, which allows it to supinate the forearm and flex the elbow, especially when the forearm is supinated. This makes pull-ups easier with hands supinated because the biceps brachii can contribute more effectively to the movement. The brachialis, while not directly related to supination, is also involved in elbow flexion but does not contribute to the ease of pull-ups based on hand position as much as the mechanics and orientation of the biceps brachii do. Therefore, all these factors together provide a full explanation.

"Pull-Ups" Are Easier to Do with the Hands Supinated Than