I have always been very active in the outdoors, and often run on a regular basis. However there have only been two periods of time when I upped the demand on my body and did a lot more regular weekly running. The first such time was when I was at University in Ambleside. I started doing early morning training runs. Here is an example of what I used to do. It was nothing too strenuous really, just one or two 1 hour runs a week. After a few weeks this caused knee pain consistently in my patella tendons. Being younger and also occupied with other outdoor activities I stopped running. Such a shame! I lived in the Lake District for 5 years, and never really experienced the joy of running through the mountains.
Then, after a long break (It's now 2010) with only occasional running I started to train at a faster pace