Yoga is a much easier way to exercise both mind and body than testing Einstein's theory of relativity by racing a beam of light. Avoid a science-related sprain with today's Groupon: for $11, you get the online 21 Day Yoga Body! course from DailyOm (a $25 value).

DailyOm provides customers with a plethora of Internet-borne courses aimed at fitness, personal improvement, and spiritual wellbeing. In the 21 Day Yoga Body! course, veteran yoga instructor Sadie Nardini provides pupils with daily missives including tips and workout videos that make yogic instruction easier to follow than confusing diagrams or cryptic Morse code. The workouts can help practitioners lose weight, tone muscle, and increase energy, and each lesson includes simple diet and eating tips that keep yoga-burned pounds at bay. A potent selection of audio meditations and mantras chisel minds to match newly svelte bodies by providing pupils with a noggin full of tools to fight off feelings off helplessness, defeat unhealthy cravings, and terminate relationships with sweets-pushing cookie monsters.