http://www.runnersworld.com/shoe-guide/runners-world-2016-fall-shoe-guide
Shoes that have good heel cushioning and are flexible.
Scores range from 1-100. 100 being the most (stiff, heavy, ...)
1. Flexible vs Stiff - According to the American Academy of Podiatry, a running shoe should be flexible in the last third of the shoe (the toe end); there should be resistance in flexing the middle third. A shoe that is very stiff will alter running mechanics and could cause problems with push-off, leading to calf and Achilles tendon problems.-- Dr. Cathy Fieseler
Stiffer shoes on the other hand are recommended for trail running.
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