Back Ball Crunch Hip Raise Back Extension Arm/Leg Reach Russian Twist ‹ Prev next › 1 of 6| View All1 Jason Lee Ball Crunch Lie faceup on a stability ball, knees bent 90 degrees, feet on floor. Put hands behind head with elbows out to sides and crunch up, then lower. Source: Study at Barry University in Miami Shores, Florida WIN a prize a day! Enter now! Jason Lee Hip Raise Lie faceup on floor with heels on ball, legs extended, arms by sides. Lift hips, forming a diagonal line from heels to shoulders. Hold for 1 count; lower. WIN a prize a day! Enter now! Jason Lee Back Extension Lie facedown on ball, knees bent and feet on wall behind you, toes on floor. Bend elbows by sides, bringing fists in front of shoulders. Lift upper body; lower. WIN a prize a day! Enter now! Jason Lee Arm/Leg Reach Start on all fours. Slowly extend left arm and right leg at the same time until both are parallel to floor; hold for 1 second. Return to start. Switch sides and repeat to complete 1 rep. WIN a prize a day! Enter now! Jason Lee Russian Twist Lie faceup on ball, knees bent, feet on floor. Extend arms toward ceiling and clasp hands. Keeping hips still, rotate upper body to right, then left, to complete 1 rep. Originally published in FITNESS magazine, July/August 2009. WIN a prize a day! Enter now! WIN a prize a day! Enter now!