Step by step instructions
Begin in a split stance with right foot on top of a box or step. Lower into a lunge, bending back knee directly under hip, as both arms extend overhead.
Shift weight into right leg and stand up onto step, extending left (back) leg straight behind hip as arms lower by sides (avoid leaning forward with torso as leg lifts). Hold for 1 count, then lower to return to the starting position. Complete all reps on the first side, then switch legs and repeat to complete the set.