Every Monday, Greg Plavidal, owner of the Boulder Anytime Fitness franchise, runs a special session for a group of women between the ages of fifty and eighty who used to belong to a now-shuttered Curves. Some of these women were nervous about training at a regular gym, but Plavidal's sessions are gentle, organized and easily adjusted to a participant's fitness level. For those wanting to take their workouts to the max, there's also boot camp — loud, hot, sweaty and unrelenting — with ex-marine Korey Reyelts, who served in Iraq and Afghanistan. Boulder boasts many gyms, but Plavidal didn't see the kind of place he wanted there — affordable, with a friendly, bright atmosphere that was neither a country club nor a grimy grunt-and-sweat shop — so he created one that is accommodating to clients at every level, from college athletes to retirees.