BELLY BLASTER: The plank
Lie on your stomach and rest on your forearms. Lift your body off the ground so your weight is resting on your elbows and toes. Keep your abs tight and try to make a straight line from your head to heels. Hold for 15 seconds, rest and repeat three times. Over time, increase the hold in five-second increments until you've worked up to a full minute.
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