This is an excellent exercise to improve core strength while focusing on the lower back.
Start on your knees on the ground resting your elbows on the BOSU. Tuck your toes under. Lift your knees off the ground so that your legs, back, neck and head are all in a straight line. Hold this position for 10-30 seconds, rest and repeat the exercise. Be sure to keep tension throughout your core through the entire exercise.
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