Sit-ups remain one of the best methods of reshaping the abdomen, second only to standing in front of a lit cannon. Enjoy explosive exercise with today's Groupon to Bare Hills Racquet and Fitness Club. Choose between the following options:

• For $25, you get five drop-in fitness classes, CrossFit, Sports Performance Training, and SoulBody classes (a $75 value).
For $49, you get 10 drop-in fitness classes, CrossFit, Sports Performance Training, and SoulBody classes (a $150 value).

Bare Hills Racquet and Fitness Center's experienced trainers lead fitness seekers through flexible schedules of group classes six days a week. Strengthen and condition cores during CrossFit classes, where supportive groups of fitness friends jog across a calorie-crushing spectrum of exercises that boosts endurance, accelerates agility, and promotes strength until participants can roundhouse kick through a vending machine. The certified coaches of Sports Performance Training guide students to fitness with a scientifically designed program that blends performance training with agility ladders, hurdles, and harnesses in a fast-paced quest to improve athleticism and empathize with superheroes. Finally, SoulBody classes squash stress while centering on cores and aligning posture, promoting stamina and power during sessions filled with motivational music.