Yoga Now can teach you how to do a sun salutation, or lead you through a beginner's Ashtanga Yoga course. The Yoga course has been modified to be easier to learn via voice instruction, and to be able to practice in about 25 minutes.
You can go at your own pace, the skill will lead you through a section and you can tell it when you are ready to proceed to the next section of the class.
We recommend that you try this skill in combination with actual in-person yoga instruction to make sure that you are executing the core poses correctly.