Stand with your feet hip-width apart, arms extended straight out in front of you, with your palms facing down. Take a giant step to the right, bending your right knee until it’s bent 45 to 90 degrees (make sure to keep your knee from extending over your toes). (A) Pause in this side-lunge position and rotate your torso and outstretched arms to the left, rotating at the waist. (B) Rotate back to the center and return to the starting position. Repeat the move to the opposite side. Continue alternating for a full set. 10 to 12 reps per side
To make the move more challenging, hold a medicine ball.