If You Only Do 1 Exercise to Get Stronger, This Should Be It

An elbow plank is tough enough, but make it even more challenging by adding a booty-strengthening donkey kick.

• From elbow-plank position, bend your right knee, flex your heel, and press your foot up toward the ceiling without moving your pelvis.
• Lower the bent leg slightly and repeat for a total of 15 to 20 reps. Then switch sides.