Releasing sweat is an effective way to lower your body temperature, as is taking a cold shower or swallowing an igloo. Keep your physique regular with today's Groupon: for $29, you get a one-month adult membership to the YMCA of Greater New York (up to a $215 value). Choose from 20 locations.

The YMCA of Greater New York keeps community members in peak physical condition with an array of fitness, sporting, and outreach programs. During an unlimited one-month training montage, bodies heave weights, raise heart rates on strength and cardio machines, and bulk up atrophied gills with aquatic activities. Patrons can donate sweat socially during group classes that do not require registration, such as Zumba, yoga, and cardio kickboxing. Child-care programs ($2.50/hour)—available at various locations—busy youngsters in safe settings as parents pump up muscles in preparation for tearing phone books in half.

The value of the one-month membership varies by location.