Working out regularly helps keep mind and body in balance, preventing your brain from abandoning its skull for the next well-toned pole-vaulter who walks by. Help muscles keep a stronger grip with today's Groupon: for $30, you get five 60-minute classes of your choice (a $75 value) at Keep It Tight Fitness.

Keep It Tight Fitness pulls from a grab bag of disciplines to craft workouts calibrated to push women of all fitness levels towards their corporeal goals. With your purchase of a five-class pass, you get to fill your fitness calendar with any five hour-long classes from Keep It Tight Fitness's schedule of group strength-building sessions. Tight Body Bootcamp puts lazing limbs through their paces with low-weight, high-repetition sequences designed to strategically fatigue muscles, like a parent letting a child go down the twisty slide an extra 50 times before bed. For a slower pace that retains intensity, hot Vinyasa flow yoga synchronizes breaths to a changing series of yoga poses, using 90-95 degree temperatures to coax out stiffness. Latin-inspired Zumba classes use fast and slower rhythms to charm calories away from the body and add resistance training to a dance-party atmosphere, mimicking a traditionally barbell-filled Brazilian discotheque.

Staff from a wide spectrum of athletic backgrounds preside over a supportive sisterhood of sweat in Keep It Fit Fitness's spacious facility. The modern space is brimming with up-to-date equipment for classes like stairclimbers and ellipticals, along with more Luddite-friendly tools such as kettle bells and exercise balls. Pretend you're in the training montage of a feel-good film about an underdog's rise to win the Olympic gold medal in spinning with a well-curated soundtrack of heart-pumping dance tunes or smoother, yoga-appropriate sounds.