One of the hardest workouts I have ever done on the track is the 4x2mile I did last March, right before I ran my PR 1:10:04 in the half marathon. My splits in the workout at the time were 10:19, 10:19, 10:24, 10:32.
Today, I did the same workout, in 10:01, 10:01, 10:04, 10:14!!
I shaved basically 20 seconds off each interval with perhaps even less rest between each and averaged 5:02 pace overall(last time the average was about 5:12)...so I shaved off 10 seconds per mile during this workout. If my half marathon pace is 10 seconds per mile faster this time around, that puts me at 5:10 race pace....which is 1:07:43 for the half marathon.
If I can do this next weekend, it will be a major breakthrough.
then if weather condition is great, you can pull addtional 2:43 off, and finished at 1h'05m'...
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