Yogis developed hot yoga in response to cold yoga, whose ice-sheet mats and growling-polar-bear instructors had become unpopular among students. Enjoy shiverless stretching with today's Groupon: for $39, you get five yoga classes at Hot 8 Yoga in Santa Monica (a $100 value).

The instructors at Hot 8 Yoga enlighten exercisers in eight hot yoga styles within a spacious, climate-controlled studio equipped with a heating system designed to stimulate the organs and glands of the human body. Utilizing oxidation purification and germicidal UV light, the heating system maintains an odor-, germ-, chemical-, and allergen-free environment that allows each student to stretch in the safety of scientific words. With air at an optimal 60–70% humidity, pupils can position themselves in standard yoga postures or enroll in Hot 8 Sculpt classes to unify yoga movements with free weights, increasing strength with longer and deeper stretches. Hot 8 Yoga Barre fuses body sculpting and cardio with ballet, spiritually transforming stretchers into tutu-ed marathon runners.

All of Hot 8 Yoga's classes are conducted atop shock-absorbent, hypoallergenic floors. Students can sprinkle off sweat in the men's and women's shower rooms, complete with granite-topped flooring and $2 rental towels for drying off or playing impromptu peek-a-boo. Optic nerves can stretch themselves over the website for a full list of yoga styles and class times.