If you’re already fairly flexible, you might want to consider Ashtanga yoga. This form of the discipline is very intense and often used by top athletes, explains yoga instructor Kimberly Fowler, author of The No OM Zone. Ashtanga yoga may be referred to as “flow” yoga and is great for those who are comfortable performing a variety of poses rapidly and want to feel like they’ve gotten some cardio from their workout. There are six different series of poses, ranging from simple to advanced, that students move through sequentially. Don’t try Ashtanga if you’ve never taken a yoga class before; instead start with a more mellow form called “mysore” (no pun intended) that allows you to practice at your own pace.