exercise videos always on knees

I have been looking for a video to get to do at home when I dont go to gym. Every one Ive looked at they always get on the knees or do a lot of lunge/squats. I have had one knee replaced but the other is very arthritic and hurts to do that kind of stuff. Is there any out there that I would be able to do? Even the yoga videos Ive looked at gets on the knees.