The body is a temple that must be maintained and respected, not converted into a terrifying shrine of Twinkie-worship. Respect your divine confines with today's Groupon: for $40, you get four fitness-boot-camp classes at Sky Frog Studios in Corte Madera (a $120 value). Boot-camp classes meet twice weekly—on Saturday from 8:30 a.m. to 10 a.m., and Saturday from 10:30 a.m. to noon, with additional classes added based on demand.

Sky Frog's experienced strength-smiths flit across the polished wood of the studio's digs, forging muscled paragons of well-being. Pilates, yoga, and cardiovascular exercise are blended across four boot-camp classes, which cull the benefits of each form to burn calories more efficiently than archaic exercises such as aerobic toothbrushing. The intimate classes never exceed 12 students, promoting the performance of elegantly muscled sonatas with maximum input from Sky Frog’s knowledgeable instructors. Build the strength necessary for competitive gesticulation in the hospitable studio, which welcomes students of all levels of athleticism, experience, and krumping ability.