: #shoulderwarmup ... #stability is super key for developing the shoulders and upper back. I swear by i's, y's, and t's. They've helped me keep the function and strength in my shoulders by strengthening the rhomboids and sits muscles. I can do things now that I never thought I would. #shoulders #girlswholift #girlswithmuscle #trx #trxtraining #mobility #bodybuilding #bouldershoulders #functionaltraining