I went to the exercise link and watched the video. That's not for me, no way, my knees almost started to hurt just watching her. I like to treat my knees in a much gentler manner. I use my fingers, not the edge of my hands. It's quicker too, since I can do both knees at the same time. I just use my fingers to rub, massage, and do whatever feels good at the time. Very relaxing and helps my hands to boot because the fingers get their share of exercise too. What could be better than that? And at 91 years I have no arthritis or any pain in either my knees or my hands. Although, I admit I'm not as limber as I used to be.