Question

during your morning workout, you hold onto a fixed bar above your head with both hands and pull yourself up towards the ceiling. which of the following occurs in your arms while performing this workout?
a) the proximal segment rotates around a fixed distal segment & scapula adduct
b) the proximal segment rotates around a fixed distal segment and scapula abducts
c) the distal segment rotates around a fixed proximal segment & scapula adducts
d) the distal segment rotates around a fixed proximal segment & scapula abducts

Explanation:

When performing a pull - up, the hands (distal segment) are fixed on the bar. The upper arm (proximal segment) rotates around the fixed distal segment. Also, during pull - up, the scapulae adduct to bring the shoulders closer together.

Answer:

a) The proximal segment rotates around a fixed distal segment & scapula adduct