Here's how it's done: Step forward with your right leg into a lunge, with your hands on the floor inside your right leg. Then, bring your right hand off the floor, bending your right elbow and bringing it toward your right foot. Staying in a lunge, rotate your upper body and extend your left arm to the ceiling. Repeat this step with your right arm. Then, lower your knee to the ground to stretch your hip flexors and quads. Finally, extend your right leg and shift your weight back to stretch your hamstrings and calves. Return to standing, and then repeat on the left. (Sound confusing? Don't worry, we've included some videos ahead.)