Fitness, unlike carnival rides and sentient voting booths, knows no age limits. Get into age-defying shape with today's Groupon: for $35, you get 25 day passes to Atlantis Sports Club & Spa (up to a $625 value), with locations in Braintree, Holbrook, Hyannis, Nashua, and Danvers.

Fitness flourishes at Atlantis Sports Club & Spa, a muscle-flexing mecca filled with splashable outdoor pools (not available at Danver location) and workout-aiding gym equipment. Spill sweat on land or in water with 25 days of drop-in passes at the fitness center, including complete access to the indoor and outdoor pools (after June 30, outdoor pool use costs an extra $15). With a membership, fitness fiends can frequent the facility as often as they'd like, with an open invitation to soak up heat in the sun deck, steam rooms, and dry saunas; build muscles with strength equipment; and perfect reflection staring contests in the locker rooms (amenities vary by location). Group fitness classes, ranging from yoga to kickboxing, vary by location and can reinvigorate workouts and shake up staid sweat-inducing routines like soda on a rollycoaster. Check the website for location-specific schedules, amenities, and more.