A fair point. You're probably not running on average sub 8:30 miles unless you are training for performance in some form or fashion. Because it generally hurts

A fair point. You're probably not running on average sub 8:30 miles unless you are training for performance in some form or fashion. Because it generally hurts quite a bit. :-) With the "speed cutoff" You are also probably getting a higher percentage of males who of course have shorter life expectancy rates than women.