I have a lot of back problems, but I love jogging, cycling and swimming. I have found out that doing yoga 3 times a week allows me to do all these sports that I love so much. I took part in a 5k race about 2 years ago, and I hurt my back really bad. I got this DVD about 3 months ago, started using it (about 3 times per week), and started training at the same time for another 5k race. I did the 5k race, and the difference was incredible. I was perfect the next day. Yoga has made a huge difference for my back. Also, I would like to add, this DVD has several "mini-routines" targeted to specific sports (jogging, tennis, swimming, cycling, golf, others), every time I go jogging around my house, my back is always hurting a little bit, as soon as I do the "jogging mini-routing", the pain is gone. Something very good about this dvd too,is the fact that is divided in several parts, so it's like having several dvd's. I really recommend it. I wouldn't say that it's for beginners, you must have some practice. Another plus... his voice, it is sooo relaxing.