I mean both are true. Good exercise and sleep help sooooo much but first you have to get there. This might happen cause you decide to just give up on everything else in your life, or because someone finally gets you to do it. Whatever the reason is, once you get into it, its a positive feedback loop. Its still a bit scary tho cause you feel like youre one bad week away from your whole system getting knocked down but thats just life i guess.