24 Multitasking Workout Moves That Work All Your Muscles at Once

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 repetitions. Then switch sides.
• Do three sets on each leg.