The plank is an exercise that works the entire body, strengthening your pelvic and shoulder girdles, legs, core, back and arms. Improves Metabolism You can burn 4-5 calories per minute of planking.

80-year-old Florida man Bob Schwartz has blown that goal out of the water, recently holding a plank for a whopping 50 minutes, 100 times longer than the average recommendation for his age.