Although feeling the burn during a workout is generally a good sign, feeling the burn while sitting on the sofa means your sofa is in the fireplace. Engage in controlled, constructive body burning with today's Groupon: for $50 you'll get a one-month family membership and two personal-wellness appointments (a $184 total value) at the YMCA of Metropolitan Denver. Be sure to redeem this Groupon quickly, since it expires after only one month. Your membership is good at five Denver area locations: the Downtown YMCA in Denver, the Duncan Family YMCA in Arvada, the Littleton Family YMCA in Littleton, the Schlessman Family YMCA in University Hills, and the Southwest Family YMCA near Sheridan & Hampden.

The YMCA aims to better Denver-area minds and bodies with fitness classes, sports leagues, and exercise facilities for users of all ages. Membership (an $84 value) grants full access for two adults, their dependent children, and as many imaginary friends they can think up. Members enjoy use of top-notch amenities that vary by location, ranging from free-weight and resistance-machine workout rooms to swimming pools and basketball courts. Outgoing endurance-testers come together during athletic classes to create a calorie-consuming hive mind unattainable to solo toners. New members in need of assistance achieving fitness goals plan out nutritional and exercise routines in their two wellness sessions (a $100 value). Personal-wellness coaches develop a distinct program for each client to help prospective workout warriors evaluate their overall health, identify specific places to improve, and build muscles regardless of superfluous zoning restrictions.