Quote Originally Posted by Proximal View Post
Another function of this is to work the shoulder stabilizers, similar to doing push-ups on a balance ball.

Since the torso is not stable, this means the scapula aren’t either. It forces you to really use the serratus, rhomboids & RC’s. I’m sure the intention is not to use it as a power exercise.

Exactly. You lose a ton of power when you remove the legs from the equation.