This Grip and Back Strengthener will help make sure your body is working correctly. It is built of rubber 3D-Print material, so it can move and flex. On the grip side of things, you will slide your hand in the handle and grip as tightly as possible. But this tool doesn't just work to improve grip, ask another astronaut, (or try yourself) to grip the handle and rub against your spine. This is important because according to studies the longer you are in zero gravity, your spine expands, (which is said to be painful) by rubbing this medical tool on your back it will relieve your back pain. All in all, this is a small, easy to transport material that can keep your grip strength intact, your spine less sore, and it can even relieve stress if you squeeze it.