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 $65, you get a 10-class pass (a $140 value) to Foundation Yoga in Solana Beach.

The nimble instructors at Foundation Yoga guide limbs through poses that stretch and strengthen physiques and eschew anxiety inside a relaxing studio with bamboo floors. The diverse, seven-day-a-week schedule accommodates students of varying experiences, such as Level 1 classes that work on properly aligning the spine and rogue chakras. The faster-paced Level 2 classes delve deeper into flexibility, strength, and stability, and the Level 3 power yoga classes combine therapeutics, alignment, and stimulating music. A 10-class pass grants guests participation in any of the studio’s body-bending classes, including the all-level Yoga for Athletes that render legs, upper bodies, and molten cores pliable enough to sleep comfortably in a sardine can.