Katelyn Crosby
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Sit up straight! Slouching not only makes you look up to 10 pounds heavier, but it can also weaken ab musclesundoing all those hours spent sculpting your abs in plank position. Keep your core activated and engaged anytime you're sitting down, by keeping your back straight and your shoulders back.

Sit up straight! Slouching not only makes you look up to 10 pounds heavier, but it can also weaken ab musclesundoing all those hours spent sculpting your abs in plank position. Keep your core activated and engaged anytime you're sitting down, by keeping your back straight and your shoulders back.

Hang Tough    Sit on edge of bench, hands at sides, fingers forward, knees bent 90 degrees, feet flat. Use arms to lift yourself off bench and bring feet off floor (as shown). Hold for 5 seconds. Make it harder: Extend legs in lifted position. Return to start; repeat. Do 12 reps.

Hang Tough Sit on edge of bench, hands at sides, fingers forward, knees bent 90 degrees, feet flat. Use arms to lift yourself off bench and bring feet off floor (as shown). Hold for 5 seconds. Make it harder: Extend legs in lifted position. Return to start; repeat. Do 12 reps.