I have chondromalacia and haven't had a good cardio workout in a while. I have them in both legs and I can walk quickly. I recently got to walk with them for a little bit. They hold the foot thanks to the rubber grip, but sometimes they start to slip when you start to sweat profusely. I usually take it off to air out my legs and straps. I think this is a great alternative to uncomfortable knee pads. Also, my knees are about 17 inches long so they have enough room to put them on and still be comfortable.
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