No More Pain After Years of Suffering

I have taken to working out more. When I am at work I use the office gym on all of my breaks. I have been using the elliptical and the treadmill or I go outside and walk a mile on each break (3 per day). I have been noticing a huge difference in my legs, especially my thighs. They are sore as all get out but they are getting stronger. The biggest difference that I notice is that they are strong enough now to support my legs while going up and down the stairs and have eliminated all of the pain that I had in my left knee. That knee has been on constant pain when going up or down stairs for years and over the last few days I have not felt any! I am also not getting winded when I go up to my third floor apartment either.