Yes, Jomar is correct, you shouldn't start PT until 2 weeks post op. Before that, your surgeon may give you pendulum exercises just to keep your shoulders from freezing up. PT should start with nerve glides, manual therapy, myofacial release, trigger point release, scar management and gentle range of motion. Once you're 6 weeks post op, that's when they should introduce light strength training exercises NOT using therabands and NOT with anything resembling a push up. You probably also want to stay away from classic rotator cuff strengthening exercises. So, you'll use free weights (or something like soup cans) for awhile and gradually progress. It's a long, slow haul! Don't push it too fast. You do that and you risk developing too much scar tissue and undoing the purpose of the surgery.