Side Plank Rainbow: Begin in side plank position with upper body propped up on right elbow and forearm. Place left hand behind head. Brace core by contracting abs. Point top (left) foot and lift leg slightly higher than hip level. Trace a 'rainbow' with upper leg by tapping foot to the floor in front of bottom leg, bringing it back above your hip, and then tapping it to the floor slightly behind your bottom leg. Do 15 reps/ side.