The thing that's so great about Ashtanga is that you can step into any class, and it'll be the same no matter what studio or state you're in. That's because this type of yoga follows a sequence known as Primary Series, that never changes. It includes Sun Salutations (five A's and five B's), standing postures such as Triangle, seated postures such as Butterfly, the entire Closing Sequence, and ends with Savasana. The flow of the postures is guided by ujayii breath, and each posture is linked with a series of movements known as a vinyasa, so you're always moving. Primary Series is mostly about poses that stretch your hamstrings, but Ashtanga has another series (that some think is more advanced) known as Second Series, that involves backbends and arm balancing poses.
If you're a runner, dancer, athlete, or someone who likes to work hard and sweat a lot, you'll love Ashtanga yoga. It will strengthen your muscles and increase flexibility in every area of your body. If you can't make it to a class, check out this DVD.