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You don't have to run the entire distance at the same speed, but adapt your speeds so your average increases. You can get an average pace of eight minutes a mile, for instance, by running the first mile in 7 1/2 minutes, the second one in 8 1/2 and the last one in eight minutes.
1 Jog for 3 minutes: If you know your marathon pace, this effort is about 1 to 1.5 minutes slower per mile. 2  3 x 20/40s: This is 20 seconds fast, 40 seconds recovery. 3  Goal here is to get the blood pumping and have you ready to hit your intervals / training session at 100 percent. Jog for 3 minutes: If you know your marathon pace, this effort is about 1 to 1.5 minutes slower per mile. 2  3 x 20/40s: This is 20 seconds fast, 40 seconds recovery. 3  Goal here is to get the blood pumping and have you ready to hit your intervals / training session at 100 percent.