In fact , you probably think you know exactly the best strategy for racing the 5 - K .
The 5 - K is the most popular road racing distance in the U.S. , and you 've probably run a few .
You probably think you know exactly the best strategy for racing the 5 - K .
The 5 - K is the most popular road racing distance in the U.S. , and you 've probably run a few .