How to do it: Start standing with your feet hip’s width apart, holding the Swiss ball straight out in front of you. Lunge forward. Keep your legs at 90-degree angles, and do not let your front knee bend past your toes. Rotate your arms with the ball out to the side of your forward foot. Return to standing position, then repeat on the other side.
Reps: 10 on each side
What it works: Glutes, hamstrings, quads, core, outer and inner thighs, shoulders, chest, stability