From Our Editors
Circuit Works' more than 10 trainers subscribe to the Zig-Zag theory, which states that to get in shape, one must rotate quickly between engaging fast-twitch and slow-twitch muscle fibers. The nationally certified, acclaimed instructors teach fast-paced circuit-training exercises that alternate between aerobic and anaerobic exercises in minute-long intervals. These engage both kinds of twitches and are a step up from the more ancient method of covering someone in bugs, then covering them fewer bugs. The staff changes exercise routines weekly, fending off not only mental boredom, but the plateaus that can arrest physical progress.