Sets: 2-3 Reps: 12-25
Lie on the floor, and rest your legs on a Swiss ball with hips and knees bent 90 degrees. Extend your arms out to your sides with palms down. Dig your feet into the ball, then rotate your hips to one side and touch the floor with your knees. Repeat on the other side. Keep your shoulders down and flat throughout.
Single-Leg Single-Arm Deadlift
Sets: 2-3 Reps: 15-20
Hold a light dumbbell in one hand and stand on the opposite leg. Keeping your lower back in its natural arch, bend forward at the hips to lower the weight as far as you can without losing the arch. Extend your hips to come back up. Complete all your reps on one side, and then repeat on the opposite one.