How to: 1. Lie on your back with your legs bent, heels under knees, feet flat on the floor. 2. Extend your arms over your chest, palms facing. 3. Raise your hips so your body forms … See more

How to: 1. Start in a plank position. 2. Drive right knee toward chest. 3. Return to a plank. 4. Quickly repeat with left knee. That's 1 rep. 5. Continue alternating. Good for:rectus a… See more

How to: 1. Get into a plank position, with elbows stacked under shoulders. 2. Slowly and with control, lower both knees until they kiss the ground. 3. Return to a plank position. Th… See more

How to: 1. Get into a plank position, with hands stacked directly under shoulders. 2. Keeping core engaged, tap right shoulder with left hand as you jump feet outward. Return to st… See more

How to: 1. Start lying on back with arms on mat and hands under butt, palms down, legs raised at a 90-degree angle from the floor, feet flexed. 2. Slowly lower one leg as far down a… See more