A sun salutation, unlike a bath of corn flakes or a shouting match with the neighborhood rooster, is a healthy way to start the day. Learn to greet the dawn with grace using today's Groupon: for $29, you get five drop-in yoga classes at yogapower in Waltham (a $65 value).

Yogapower's instructors lead students ages 16 and up through an intensive form of yoga performed in a heated studio. Instead of a mechanical series of memorized poses, the 60- to 90-minute classes employ a rigorous sequence of full-body moves that, like the legal definition of treason, changes daily. Instructors heat the yoga room to approximately 88–90 degrees Fahrenheit, causing muscle tension to slacken and sweat-gland managers to mandate overtime. Sessions cater to all skill levels, allowing students to progress at a comfortable pace or earn their yogi merit badges in record time. The studio requires the use of yoga mats and towels and rents them for individual lessons ($4/mat, $1/towel). Yogapower packs its schedule full of dozens of classes throughout the week, with sessions available from the early morning through the evening.