Cathe I hope all is well with you and baby Eric--My 9 year old son's name is Erik and such a joy! Just wait until Eric starts playing sports and you start going to the games (or maybe coaching them!) what a blast. At any rate, I have some questions for you. I have your PS series, interval max, body max and mis/mic tapes--I find that I use the mic tape for it's hi-lo section a lot when my knees are bothering me. Are there any other tapes in your collection that have hi-lo in them? Also, does step height effect stress on the knees? I feel like I'm cheating if I don't use both risers--ha-ha. I have a lot of heavy tapes since I like intensity, however can you suggest one of your tapes that you consider a light cardio day. Thanks alot!!!!! Ranae