You can say goodbye to sit-ups with this bodyweight exercise, which strengthens your core and hips without hurting your spine ...
"Combination lifts like pullups with knee-ups are one of the best ways to get a lot done in a short amount of time," Smitty ...
In the second of a five-part series, Dana Santas shows how building strength in the side abdominal muscles can improve stability in movement and reduce low back pain.
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