When you consider the wide-ranging variety of classes—sparring, boxing, kickboxing, and jujitsu—Knockout Fitness seems like a fitting name for this gym. But training doesn't begin and end with flying fists—exercisers can also get fit during Zumba group exercise classes, or pack on lean muscle during circuit training or strength and conditioning sessions. Kids can set out on the path to professional pugilist or just build coordination in boxing classes as well.