Ideas for DVD for limited mobility

I have severe arthritis in my knees and when I workout, my feet cannot leave the floor. I love, love, love....my Beachbody DVDS by Chalene JOhnson. In every DVD I own of her's, there is always an instructor next to her teaching it in the low-impact modified version. I have never seen this done before in any other DVD besides Beachbody! It really makes me feel good knowing they thought of me, too, and she is aalwyas thinking of me throughout the whole DVD, as she mentions it all the time to pay attention to so-n-so (the name of the gal doing the low-impact version) if you need to modify. She says "Its okay if you have to modify, as long as your heart rate is up there, don't worry about going as hard and fast as the rest of us.

If she can walk, Leslie Sansone has a huge line of DVD's called Walk Away the Pounds. It's pretty low impact but there is someone near her that shows a modified version in the DVDs. If you have access to On Demand on cable t.v. she has some work outs on there too. Go to On Demand, Free Zone, Health and Wellness, Exercise TV and look for the walking section. I actually use this quite often in addition to Turbo Jam by Chalene Johnson (which was mentioned already). Like the other poster said, there is someone there that modifies for Turbo Jam as well but I feel like WATPs is even lower impact. And of course there's always an elliptical but it's more expensive than a DVD. You can find WATP DVDs at Walmart and Target for pretty cheap. She's been around a long time.