I am a 22 year-old pro surfer and life guard from North Shore Oahu, Hawaii. I also train in martial arts (boxing and Brazilian Jiu Jitsu). I recently lightly sprained my MCL on the inside of my left knee and thats when I found your product. I bought the Knee Spider, used it, and approved your product myself. And now, your product is a must for any extensive workout such as running, biking, or rubber resistance bands.