Day no. 16 – Single-Leg Bridge. Lie on your back, with the knees bent, and place your hands on the floor for stability. Extend the left leg out. Pressing your right heel into the floor, lift your pelvis up, keeping your body in a stiff bridge position. Slowly lower your body to the floor. Repeat with one leg for 30 reps, then switch sides and perform reps on your other leg for an additional 30 reps.