When I fist started yoga I found some of the poses too taxing for my back (so I skipped or modified them). Now that I have gotten stronger I really like this workout. It starts easy and gets more difficult. If you do what you can you will make progress and be able to do more.
Definitely heed the warnings of other reviewers: if you have lower back problems be very careful and modify some of the poses.
If you are a beginner and have not done other ab exercises before you might find this video very challenging. If you have some ab strength already this will take it to the next level.