 And what it is, is they don't get they don't get excited. They don't get carried away when certain things happen out on the track. But when you learn to not do that, your heart rate doesn't kick in. And when your heart rate doesn't kick in, you are able to bring in the necessary oxygen that it takes to have that endurance. They can go from a race car, get on a treadmill without ever doing the treadmill.