The Upside Down!
If you've never tried this one, brace yourself. It's every bit as tough mentally as it is physically. We're doing the Terrible 21's but instead of going DOWN the reps from 21 to 1, we're going to work UP from 1 rep to 21 reps. Good Luck!
1 rep of each, then 2, then 3, 4, 5... all the way to 21 of each.
Burpees and Squats
Pushups and Squats