ROTATIONAL REVERSE LUNGE
Stand with your feet hip-width apart and hold the sandbag with both hands in front of your thighs (a). Step your left foot behind you and bend both knees as you swing the bag to the outside of your right leg, rotating your upper back without arching your lower back (b). Press through your right heel and step forward with your left foot to return to standing. Repeat on the other side. That’s one rep; do 10.