Dan Martin arrived in sunny South Florida on the usual serendipitous winds that blow people here from all over (in his case, frigid Wisconsin) a few years ago. Back then, he was known as DJ Doormouse, and he scared the crap out of people. One of the pioneers of an underground American scene of noisy, experimental music, he churned out the kind of confrontational sounds and unpredictable performances that made him huge in places such as the Netherlands and Belgium. But all that DJing involved late nights full of smoking, drinking, and bad posture, and by his early 30s, it was taking a toll. Martin recalled his past as a top-level amateur track athlete and soon threw himself as intensely, eccentrically into fitness as he had done with music. These days, he's co-owner of a scrappy but rapidly growing Crossfit gym on the Morningside-Little Haiti border, where he leads his new fans in hoisting barbells instead of record crates. While you can still catch him DJing at a few low-key venues such as the Vagabond — sometimes even with a gas mask on to filter out the smoke — his most exciting residency is definitely in the weight room.