When I first moved back to Boston I was bar-tending (okay I was a waitress who occasionally tended bar haha). One night my roommates came in and everything they order came "with a twist!" I do not know what made me remember this the other day...but I figured why stop with cocktails...let's twist up your push-ups!!
Start in plank, draw opposite knee to opposite elbow, extend the leg (this is intense & totally feel free to stick with just this) with the leg extended add your push up and return to the starting plank position. I like to alternate sides each rep.
Rock it & tone your abs & arms at the same time!!