On the last mile, when your legs are tired and your lungs are burning, just get angry. Get angry for being tired. Then run faster. I do not know who is responsible for this fitspirational running quote but they have never pulled a sled for 1,000m before running a mile.
E:90 15 min
100m Sled Pull- Lt and fast 45/25
Rest 5 minutes
Run 1 Mile