by Jeff Gaudette, Published Sep. 30, 2014, Updated Jan. 18, 2016 at 12:29 PM UTC
There's a scientific explanation as to why the vast improvement in your workout times don't always show on race day.
Start your FREE subscription to Competitor Digital today!
Get our monthly digital magazine, weekly running content & exclusive offers delivered to your inbox.
© 2014 Competitor Group Inc. All Rights Reserved