Leave the Crossfit injuries to your coworkers and ditch the screaming-in-your-face-before-sunrise bootcamp. There is no endorphin boost like getting in fighting shape. That phrase is not just an aphorism; the level of fitness required to adequately defend yourself and stand a chance against someone fitting to knock you out has no parallel. Getting there is hard work, but trainers skilled in Muay Thai, jiu-jitsu, and boxing teach classes morning, noon, and night at this Mission District staple co-owned by UFC fighter and Golden Gloves champion Chris Cariaso and Muay Thai master Bunkerd Faphimai. Kids and adults of all fitness levels can also try out a class before deciding which discipline is best for them — and if trading blows is not your thing, no worries. You can learn all the moves and become ring-ready without ever throwing a punch. Sometimes knowing you could is more than enough.