It's the most dynamic form of yoga around and Ashtanga's many benefits include improved flexibility, strength, and calm. From beginning sun salutations, through standing and seated postures, to the finishing positions, these pictures guide your body while captions instruct you on proper breathing. One spread, for example, takes you smoothly through a forward bend, into the basic "downward dog" posture, finally ending on the ground with a stretched out, arched back "cobra." You won't miss out on a single segment of the motion.