That running automatically results in hip and knee injuries used to be commonly believed in the medical community. Then this study (and others since) have chang

That running automatically results in hip and knee injuries used to be commonly believed in the medical community. Then this study (and others since) have changed that thinking. http://www.ncbi.nlm.nih.gov/pubmed/23377837 http://www.ncbi.nlm.nih.gov/pubmed/23377837 From my own personal experience, I know that running too much, too soon, before my body had adapted, resulted in various muscle strains and sore knees. But as I got smarter about my efforts, I discovered that all I had to do was allow time for my body to adapt to the workload. I also run mostly on softer trails and buy new shoes periodically and that helps too. For me, there is nothing that can compare to running outside on a trail through the woods, especially if there are friends alongside.