im going on vacation, I will have a rowing machine and a exercise bike. I am thinking about going to sports authority and picking up some exercise equipment i can bring with me. I am thinking about buying push up handles....im not sure what else. 1. Is there any other good equipment I could buy for vacation? I plan on doing a shitload of push up, sit ups, burpees, squat jumps, all with a ton of variations.... 2. any other ideas of exercises i can do w/o weights?