Gold's Gym Washington, Seattle

Since its 1965 founding in Venice Beach, California, Gold's Gym has dotted the globe with more than 600 locations where professional athletes and exercise newbies gather under the umbrella of personal strength. Nearly 3.5 million Gold's members chart and aim for their fitness peaks, perspiring beneath the gaze of certified personal trainers or pedaling beside peers at cycling sessions. In a diverse lineup of group classes, patrons strengthen cores with Pilates, finger-paint pictures of ninjas in martial arts, and amp up heart rates in cardio routines. Many Gold's Gym locations stockpile futuristic amenities, such as cardio machines with individual iPod docks and televisions that help keep patrons motivated.