Deciding to do this workout is the bold choice. What follows is push-ups, squats, and punches cycling through each other relentlessly until the set is done. The push-ups are low in count on purpose - 2 reps at a time, appearing five times per set. That sounds easy. It is not easy. By the fourth or fifth appearance the chest and arms have a very clear complaint and not enough rest to file it.

Squats keep the legs in the conversation. Every time the body gets back up off the floor from a push-up, the legs have to load and fire through 10 reps before the floor comes back around. Punches sit between the squat and push-up blocks and do two things at once - spike the heart rate and give the pressing muscles just enough of a break to make the next push-up set feel almost manageable.

The bold part is how much ground this covers in a single set. Upper body, lower body, cardio, strength - all of it, back to back, with no room to coast. The low push-up count is a trap the body falls for every time. Fresh at rep 1, cocky at rep 2, reconsidering everything by set four.