Take it Out!, Boulder

The instructors at Take it Out! aren't exactly anti-gym, but they are anti-ceiling. They prefer to sweat beneath the sky alongside their students, who follow them through boot-camp drills, running routes, and strength-building exercises in Boulder Central Park. Their classes combine the galvanizing energy of group workouts with the sense of liberation that comes from exploring nature—a counterpoint to the constricted, crowded feeling of indoor fitness venues and home gyms inside your broom closet. Even their personal-training sessions can be scheduled outside.

Their curriculum covers sports- and triathlon-focused training in addition to more generalized routines. Each lesson takes a balanced approach to conditioning with movements that improve core power, agility, and endurance. And, if the weather is bad or too cold, classes move to shelter at Body Dynamics.