 And I wake up, no stiffness, no pain whatsoever now. And it's been that way for years. So it does work. And can you talk about the causes of some of the muscle problems as well? Why do people wake up and their muscles are sore or stiff or they have a tough time until they maybe stretch a little bit? Why are people waking up with stiff muscles? Well, a stiff muscle usually comes from a muscle that is not...