Perspiration gets mischievous when cooped up inside the body, acting out by drenching armpits on first dates and disguising itself as tears during job interviews. Release disgruntled body water with today's Groupon: for $22, you get a one-month pass to group fitness classes at Synergy Fun + Fitness Center in Valley Center (a $45 value).

Sporting a wide expanse of wood floors and a swinging sound system, Synergy Fun + Fitness Center packs its 1,400-square-foot space with exercisers enjoying invigorating fitness classes. Experienced instructors lead shape-shifters through body-limbering basic yoga, and plumb the depths of relaxation with prop-assisted gentle yoga. Editions of calorie-singeing Zumba classes range from basic steps to kid-specific, allowing hip-swivelers of all ages and skill levels to get caught in a cyclonic fusion of Latin dance and global beats. Hotwire inner engines with cardio cross-training and step-cardio-mix classes, which keep tickers guessing by combining step aerobics, high- and low-impact kickboxing, and Zumba moves; or, students can remove Hong Kong wire-fu cables for the turbo kick class, which choreographs kickboxing routines inspired by tae kwon do, tai chi, and dance. Synergy Fun + Fitness Center holds classes seven days a week; check the schedule for a complete list of days and times.