Lorna Macphail instructs the following:
ashtanga yoga : all levels
A vigorous practice, moving from pose to pose at a sustained pace. Expect a workout that builds up strength, flexibility and stamina.
The same sequence of poses, the Primary Series, is repeated in each class so you ultimately commit it to memory and can move on to self-practice. When fully integrated, the practice becomes like a moving meditation as you no longer need to remember the sequence.