I've done a lot of dancing, but Richard changes the routines very quickly with very little explanation. This video is confusing and would not be good for your knees if you're doing it on a carpeting living room because there's a lot of twisting. I gave it away after only going half way through it. However, for an excellent strength training video, try his Blast and Tone! It's extremely well done. Good routine, very well explained, appropriate cautions/reforcements suggested. I look forward to using every other day. And, it's working!