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If you have even the most basic knowledge about running, you probably know heading out for a 20-mile run would be nearly impossible if you haven't worked up to that point. The Importance of Building a Running Base http://www.active.com/running/articles/the-importance-of-building-a-running-base?cmp=17N-PB33-S31-T6-D2-2232016-1147

If you have even the most basic knowledge about running, you probably know heading out for a run would be nearly impossible if you haven't worked up to that point. The Importance of Building a Running Base