Weighted Pull-Ups
5, 5, 3, 3
First round = 20 squats/1 push-up, second round = 19 squats/2 push-ups, third round = 18 squats/3 push-ups, continue on until you end up at the last round with 1 squat/20 push-ups. Each round will equal 21 total reps.
*Below is a perfect example of scaling. One person is doing weighted pull-ups (with a 50 pound dumbbell). While another person is doing pull-ups with some assistance. Same exercise, different abilities, equal intensity!