im not sure if anybody has mentioned these yet, but no footed planches are an amazing workout. i learned them through gymnastics. and a couple backtucks, or "backflips" will rape your abs. trust me if you can do 10 good slow no footers and 10 backtucks your upperbody will feel like its being ripped in two.

by the way, no footed planches are not for the weak lol.
you go into a normal pushup position, then move your hands back to around your hips, then slowly extend as if doing a normal pushup when you go up lean forward and lift your legs off the ground keeping them perfectly straight.

its nice