I have a question - can it be done standing up prone (torso bent over like in a rear delt raise)? I tried T's, Y's, L's, and W's on the stability ball yesterday and I could only feel my shoulder blades squeezed together during the T, L's and W's (my focus is strengthening the mid and lower trapz to balance with my upper trapz, which is very tight and a lot of muscle). During the Y's I had trouble feeling my shoulder blades squeezed together. I want to take out the work of the upper trap as much as I can.
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