In the second of a five-part series, Dana Santas shows how building strength in the side abdominal muscles can improve ...

The next level of course would be the side plank, a challenging variation of the original abdominal bad boy. The side plank ...

Press into top leg and bottom forearm and engage core, glutes, and inner thigh to lift hips and bottom leg off the floor. Keep shoulders, hips, and knees in one straight line. (For a modification, ...