"And never forget that all emotional and physical anguish is finite! It all ends eventually. Smile at pain and watch it fade for at least a second or two. If you can do that, you can string those seconds together and last longer than your opponent thinks you can, and that may be enough to catch a second wind. There is no scientific consensus on second wind. Some scientists think it’s the result of endorphins flooding your nervous system, others think it’s a burst of oxygen that can help break down lactic acid, as well as the glycogen and triglycerides muscles need to perform. Some say its purely psychological. All I know is that by going hard when we felt defeated we were able to ride a second wind through the worst night in Hell Week. And once you have that second wind behind you it’s easy to break your opponent down and snatch a soul. The hard part is getting to that point, because the ticket to victory often comes down to bringing your very best when you feel your worst." - David Goggins