How to do this workout: do a bit of a warmup — jumping jacks, jump rope, or just jogging in place for a few minutes will get your heart rate going. Then do the exercises in order, for 30 seconds to two minutes (depending on what kind of shape you’re in), with as little rest in between as possible. If you’re new to exercise, feel free to rest fully between exercises, but if you’re in decent shape, doing them one after another is a great workout. Like me, you’ll probably have to stop to catch your breath a few times — it’s a tough workout!