Push-Ups

If you're already doing full push-ups, here's how to improve your fitness score: Start by doing half the number of repetitions you can do, rest 30 seconds, repeat that same number of push-ups, rest 30 seconds again, and then repeat the push-ups.

Do this two or three times per week, decreasing the rest period by 10 seconds each week. Retest your max after three weeks.