One-hour fitness classes for all fitness levels include kettlebells, cycling, TRX, boxing, and boot camp

Members get beach ready with cardio and strength equipment and personal-training sessions in a 24-hour gym

Membership includes childcare and group classes; ladies use kettlebells and bosu balls to whip themselves into shape in indoor boot camps

ActivTrax kiosks personalize workouts at five locations with pools, group fitness schedules, and cardio and weight machines

Tone muscles and burn calories during a 45-minute circuit of sprints, plyometrics, and strength-training drills led by a certified trainer

Personal trainers burn calories with intense interval training, boot camp, and Zumba classes powered by high-energy music

Slow- and fast-pitch baseballs and softballs hurtle at batters in indoor hitting cages with self-feed machines

Clients get 24/7 access to fitness equipment with fitness assessments at 22 locations

Multitalented fitness instructors lead full-body boot-camp workouts, Zumba, and yoga classes

Cambridge boasts a saltwater pool with retractable roof and a sundeck with cabanas; Nashua has an indoor and outdoor pool