Today, in any order/combination:
50 Ring Cranks
Note: doing the ring cranks, remember, you are not a gymnast like the guy in the video. Or maybe you are. But you probably aren't. Just go from the ground to a vertical, inverted position, like he does, as slowly/smoothly as you can. On your way back down, bend your abs and make it like an "L-sit" as you lower yourself back down.