A thousand pounds of Epsom salts will get anyone, no matter how dense the bones, a feeling of weightlessness. You will float. In your own private room, you step naked from the shower to the tank. The water is warm, and while you float, no sound or light will distract you from a trip into a theta-wave state of mind. Claustrophobes can float with the tank door wide open and advance to it being propped open a little bit with a towel. That zero-gravity sensation isn't only for space travelers.