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EXERCISE TUTORIALS: CORE • 18s
Lie flat on your back with your fingertips behind your head, your knees bent, your legs together and your feet flat on the floor. Your elbows should be in line with your ears, or just below. Raise your upper body until you’re sat upright, or as close as you can get. As you do the exercise, you should feel your abs tighten.
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Start lying on back with your arms extended overhead on the floor and your legs straight resting on a mat. At the same time, and with control, lift arms, head, shoulder blades, and legs off the floor.