The Beach Body Workout

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No. 3 Plank

Lie facedown with legs extended and elbows bent and directly under shoulders; clasp your hands. Feet should be hip-width apart, and elbows should be shoulder-width apart.

Contract your abs, then tuck your toes to lift your body (forearms remain on the ground); you should be in a straight line from head to heels. Hold for 60 seconds or as long as you can.