23. Glute kickbacks
Be sure to flex your butt for a one-count when your leg is fully extended back behind you. Your goal is to complete 3 sets of 20 reps, with 30-second rest.
STEPS:
1. Get down on all fours on the ground, keeping your back straight.
2. Slowly kick one leg back behind you, extending the knee.
3. Once it’s as high as it can go, lower it back down so it’s almost touching the ground and switch sides.