Yoga is one of the world's oldest forms of exercise, second only to holding the earth on your shoulders. Practice ancient athleticism with today's Groupon: for $30, you get five drop-in yoga classes from Healing Space Yoga (a $60 value). Classes are held every Wednesday from 6:30 p.m. to 8 p.m. at the Hindu Temple on Penney Lane.

National Endurance Sport Training Association–certified yoga instructor Linda Barnes leads students through physically and mentally challenging classes. During each 90-minute session, as many as 30 participants can practice yogic breathing while moving gracefully through a series of seated and standing poses. Linda invites her charges to perform back bends, sun salutations, twists, and inversions, which culminate in a final meditation on the yielding, transitory nature of the pretzel. Each class ends with a guided relaxation and meditation period, enabling students to absorb what they’ve learned without having to wring out a sweat towel afterward.

Participants must arrive 15 minutes before the start of class to redeem their Groupon.