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Class junkies will love this trendy River North spot, which offers two floors dedicated solely to classes, like B.L.T. (butt, legs, and thighs) and SWAT (a boot camp/CrossFit-esque workout). The gym is also open for individual use when classes aren’t in session, typically during the day. A cashless system at the front desk makes it easy to purchase water, snacks and other retail items.