Ashtanga is a set sequence of poses that is practiced the same every time. It is generally practiced 6 days in a row, with one day of rest. Ashtanga also honors the moon days, by not practicing on full moon and new moon days. Some studios offer Ashtanga classes, but they generally aren’t led classes. The Ashtanga time will be for 90 to 120 minutes and an instructor is present, however students work through the poses in the sequence on their own. If you are interested in trying Ashtanga, definitely worthwhile to find a class that is led so that you aren’t fumbling through or feeling intimidated by the regular practitioners.