We are staying with friends here in Phoenix and have been out and about, hiking the desert, attending ball games. Just a passing note, every now and then we come across a jogger in the hills or on city streets, and these folks always look like they are in pain.
I used to run, never more than twenty miles a week, and thoroughly enjoyed it. Then my knees started to hurt, but I kept at it. Finally I had surgery on one of the knees and the doctor told me to stop running. I thought my hiking days were over, as I believed that I needed to run to stay in shape for climbing and carrying weight.
I was wrong. After recovering from the surgery we have hiked a lot, and my legs are always fresh, even bouncy, and I can easily endure long treks. Of course there is always some pain involved, but the pain was much worse when I was a runner.
So as I look the runners and their grimaces, I understand the impulse, and am grateful that I quit before I had destroyed my knees to the point where hiking the hills and mountains would be impossible. By blowing out a knee early on, I was able to keep the ability to stay mobile.