You can lose much more in the first few miles of a race than you can gain. Photo: PhotoRun.net
Most coaches and experienced marathoners will tell you: The marathon doesn’t become a race until the final 10K. In order to reach the final 6.2 miles with enough juice in your legs to race toward the finish, you need to relax and settle into a rhythm for the first 20 miles. This is the key to a negative split (running faster over the second half than the first).