Looking for the most intense -- and rewarding -- three days of your life? Then take the complimentary three-day challenge from Equinox Fitness Clubs: one day of strength training, one day of group fitness, and last, but not least, a guided workout led by a no-shortcuts personal trainer. Hit any of their three Bay Area locations to spend one day rocking your body with state-of-the-art equipment, then cool off in opulent locker rooms stocked with luxury amenities from Kiehl's Since 1851. Invigorate your second day with their abundance of group fitness classes, from the core-carving ViPR, to the equally grueling Barre Burn, to Whipped, which uses kettlebells and strength ropes to whip your body, whip it real good. On the third day, rise to the challenge with an inspiring session led by a graduate of the Equinox Fitness Training Institute. Start the Three-Day Challenge with Equinox today, and earn the right to bare arms.