Question

How does muscle activity vary within the primary agonists (prime movers) when comparing a wide grip pull up (hands in pronated position) to a close grip (curl grip) pulldown? Please make reference to; muscle activation differences, rage of motion differences as well as the stronger reliance on secondary muscle groups to add to force production capability

Answer 1

Please find answer explaining difference in tabular form.

	Wide grip pull up	Closed grip pull down
Primary agonist	Lattismus dorsi, trapezius	Biceps, lattismus dorsi
Muscle activation difference	More recruitment of lattismus	more recruitment of biceps
Range of motion difference	More range of motion of shoulder girdle	More range of motion of glenohumeral joint
Secondary muscle groups	Supraspinatus ,serratus anterior	Posterior deltoid trapezius