A Step-by-Step Guide to running surfaces

http://josueekyn284.angelfire.com/index.blog/1659689/why-you-should-focus-on-improving-running-surfaces/

Asphalt - Now you would believe that asphalt is simply as bad as concrete, however it is not. It's in fact about 8 times "softer". The real problem with running on asphalt roads is not the hardness, however the