When I was 62 or 63, I used to get these intense pangs of pain that would last for about 10 seconds and then fade and then come back in 2 or 3 minutes. I would try to watch television, and it was INTENSE. Rebounding took it away. Rebounding does something wonderful. And when I am too tired to go to the gym, and I can at least rebound. I am 65 years old.