It's quality of life too. For pretty much every human, finding a way to get outside and breath hard is going to feel good. You're gonna sleep better etc.

Yeah we all know people who drink 3 cokes a day and aren't fat etc... but I know if I drink a lot of beers or cokes or whatever I feel terrible. When I go for hill sprints I feel amazing after.

It's clearly a good habit in a healthy life.