I stumbled upon this site and researched their stuff. After talking with the owner, I purchased both their basic Crossover Symmetry system and the Iron Scap system. I am VERY impressed. www.crossoversymmetry.com CharlieFederer has posted the Thrower's 10 exercises for shoulder maintenance. Those exercises are great but doing the requisite number of sets of each exercise for each arm (yes, work BOTH sides of your body) takes a long time and I'm guessing very few in here do all of them regularly. This program works all that stuff and does it very efficiently and effectively. Crossover Symmetry is designed to address rotator cuff and scapular muscles, and is part recovery tool and part strengthening/rehab tool. Iron Scap is designed to help create a more stable, functional scapula and shoulder position. One objection I hear from people when I point them to this site is "well, I could do all of those things on my own without their expensive cables." Yes, you could. But you won't. Getting the logistics of all of this stuff setup is a pain in the butt. Getting multiple bands of the appropriate resistance for light, medium and heavy work, getting them setup the appropriate distance from each other, moving them through the 2 elevation positions, doing all of that on your own is so unwieldy that most simply won't do it. I wouldn't. I didn't. But with this setup, it makes it easy. I use the door belts and leave them on one of my doors. Then hooking up the cables takes about 20 seconds and then I'm ready to go. I setup the exercise plaque right in front of me and I'm launching my workout with minimal resistance. I've already felt a very positive effect from doing this stuff. I highly recommend these programs to anyone who engages in an overhead-based sport, like tennis. Finally, I have no affiliation with these guys other than as a customer. I won't make a penny off any sales. I'm recommending it because I think it's a great product for those who love our sport and want to play it for a long time.