I can't do those tuck jumps and aerial jumping jacks. Can anyone offer a
>suggestion as to what I can substitute to get the aerobic
>benefit, but without falling flat on my face? I have noticed
>these moves are in Boot Camp too.
My tuck jumps are pretty "tuckless," so I just do a high jump in place. For jumping jacks, I just do what I can, and either focus on height (with a tiny split) or on width (with a wider jump, maybe not even airborne, but powerful), but usually both don't go together! I am getting better, though. Just keep trying them (either lower or narrower, or alternating) and do what you can, and you will improve. (Except those tuck jumps for me...which I can only do with a tuck on the rebounder...which is another option for doing these).