Curves' 30-minute workout whittles women with a signature circuit of hydraulic resistance machines designed to work with female bodies and promote weight loss, protect against osteoporosis, and deal with arthritis. Ladies can hop into the circuit circle at any of 13 strength-training stations, each of which works to tone two major muscle groups. After 30 seconds of repetitions, they step onto a nearby recovery board, which welcomes women to walk, jog, or speed-skate in place for a half-minute. This cardio burst jolts the heart rate, torching more calories as exercisers move onto the next resistance-training machine. An experienced trainer is always nearby to help manage participants’ machine maneuvering and Play Doh–based muscle making.