Start in a standing position and take step back with the right leg into a lunge position. Keep the knee on top or just behind the toes on the leg left. From this lunge position, raise the hands overhead and stretch toward the sky. Return to the starting position by driving the left leg through the ground and bringing the right leg to its original spot. Alternate legs with the given number of reps. This exercise creates extension from the torso to the hip flexors while working on single leg strength.