It really depends on the box and what you want to get out of it. I have a friend who didn't start Crossfit until he had completed a Tough Mudder but there are plenty of overweight people who do the Crossfit classes at my gym. If you're used to exercising at an intense level, I'd say go for it. Crossfit boxes also make you take 4 Foundations classes in order to learn the basic moves and format so you could use those classes as a test to see if its something you'll enjoy long term.
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