If you’re looking for the top exercise trends of 2013, try looking elsewhere. Unlike the American College of Sports Medicine, which releases an annual top-20 list of what’s hot in the workout world, our list includes only the weird, the wacky, and the wild—the things that make you turn your head when you see them at the gym or on the track.
But is catching your eye enough reason to jump on the eccentric-exercise bandwagon? Maybe not, but some of these could be on their way to top-20 status. Before you join in, find out what these weird trends are all about—and whether there’s any science to back up their flashy oddness.