Heat facilitates fitness, which is why we gain weight during frosty months and after swimming in pools of frozen custard. Break a healthy sweat with today's Groupon: for $29, you get five drop in-yoga classes at Yoga By Degrees in Wheaton (an $86 value).

Yoga By Degrees offers a spectrum of heated classes ranging from 80 to 105 degrees in a schedule of more than 40 yoga classes each week. In beginner basics, novice yogis learn basic poses and breathing techniques as all 80–85 degrees coax muscles to new levels of flexibility. Yoga Sculpt employs bends and flows that chisel by incorporating light weights and raising mercury levels to 90–95 degrees, the same temperature used to melt Barbies into svelte shapes. 105-degree classes beckon beads of sweat as core poses, balancing sequences, and breathing techniques strengthen the mind-body connection. Instructors full of spine-bending experience prevent the accidental pretzel twists of less adept guides.

Energies ignite in the front area painted in invigorating reds and yellows. On the walk through the archway and into practice areas, tranquil colors and simple furniture set a relaxed tone. Students pose and perspire in one of two sleek studio spaces with specially designed yoga floors. Locker rooms offer hair dryers, sinks, and lockers for postclass primping. Yogis should plan to bring their own mats and towels to class or rent them from the studio for a small additional fee.