I am 61 and wanted a set of exercise videos to keep me limber and strong. Mirabai Holland's trilogy for beginners is perfect for me. After the initial viewing, I could follow along, even though I couldn't do all exercises completely. She goes slow deliberately so that you can feel the muscles working. The trilogy is good for me because I tend to tire of using the same program daily. This way I can rotate which one I do each day. I also purchased her video for strengthen bone mass and I like that one also. If you want an exercise program you won't get bored with, try the trilogy.