This is actually a requirement for me now, every day or at least 4 days a week. I love it and I can’t stop. Although, a friend of mine said he’s actually burned out from jiu jitsu: that he has been doing it for, like, 5 years, and he doesn’t really want to do it anymore. For me, I physically cannot stop, it causes inefficiency in everything else I do. So, it’s curious. But the bottom line on physical fitness is, you have to do it, consistently, forever. This way, you can also start being good or great at everything else you do.