Do you stretch everyday but still wish your body could be more flexible? Try reciprocal innervation. It’s a method where you fire up one muscle group to allow the opposite muscles to relax, giving them a deeper stretch. Let’s say you’re working on your hamstrings: Contract your quads for a few seconds, then release and pull your legs closer to your torso. Each time you contract and release, you should be able to go a little bit further.