2. One-Arm, One-Leg Plank
Why it works: This move challenges you to keep your back flat and stabilized.
How to do it: From a pushup position with forearms on the ground (shown here), push up and support your weight on your elbows. Tuck your chin so your head is in line with your body. Lift one arm and the opposite leg, hold for two seconds. Switch limbs.
Prescription: 10 reps per sideBack to top