TRX

last spring i took TRX classes in preparation for Tough Mudder - i thought they were great, and my upper body strength improved a lot (was able to graduate from knee push-ups to toe after a few weeks - i'd never been able to do that before).

if you have a chance to take a class, i'd take advantage of it. or at least look up some youtube videos. i didn't realize how versatile the system was until a trainer showed me how to do exercises with my feet in the stirrups - push ups, planks, crunches, pikes - they get a lot harder when you throw in the elevation mixed with keeping feet level/balanced. TRX is also great for warm-up/cool-down stretches.

My gym offers TRX and we have amazing trainers leading it! Like any program it depends on who is delivering the class and what training they have. The over all program will build core strength, increase your endurance, and create bonds among participants! Our Gym charges $99 in addition to regular gym fees for a 6 week class that meets 2 times a week. well worth the personal investment ! Good Luck !