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Title: Be careful not to overwork your knees
Review: I agree with other reviewers who have commented here on the effect of this video on one's joints. I myself developed a very bad knee problem because of this video that lasted for months. The video is too fast so it doesn't strengthen your muscles, just puts a lot of stress on your joints. Cindy's form in this video is pretty terrible, particularly in lounges, where her knee goes way over her toes.I use this video occasionally for abwork and stretches, but when I do use it, I don't do the reps as fast as she does.Instead of this one, I would recommend the sequel to this video (New Challenge) which is quite decent.
