did you wrap the single segments of the arm seperately for movement, or is it just glued that perfectly that it looks like that? what i meanis did you wrap forearm, upper arm and shoulder seperately?
also, what did you use, spray glue?
I roughly cut out the muscles using 1 inch upholstery foam. I skinned it with 1/8" upholstery foam. I used as big of pieces as posible and hid the seems in the creases. Back is Two pieces, chest one, shoulders one each and arms one each. I tried using spray adhesive but switched to barge rubber cement because the spray was not strong enough.