I experienced a period of forced inactivity which caused a calcium buildup in my right knee. It was very painful to bend past 15 degrees with my weight on it a

I experienced a period of forced inactivity which caused a calcium buildup in my right knee. It was very painful to bend past 15 degrees with my weight on it and would collapse under weight. A friend I had who was a big fitness buff suggested I start walking stairs to fix it. I started out with 5 minutes a day for the first week, then 10 for a week, then 15. I climbed a single story flight of stairs and then turned around and descended, repeating for the workout time. After a month, the calcium buildup was gone. After three, my legs were so strong I felt like I was bouncing on springs when I walked. I was taking the steps two at a time when I climbed and didn't get winded at all. Great aerobic workout!