High-intensity exercise, without pushing muscles to complete failure but getting close, can increase resting growth hormone levels by 300-500% and growth hormone during the following night's sleep by 300-500%.

“It does appear that high-intensity exercise, but again as discussed in a previous episode, not exercise that brings muscles to failure but close to it. So if it's weight-bearing exercise, it would be getting close to that final repetitions where you can't complete them but not pushing through those or even going to failure but getting close leads to anywhere from 300 to 500% increases in resting growth hormone levels and 300 to 500% increases in growth hormone the following night when you go to sleep, which is incredible.”