this is what you do...
1. LSD (long slow distance) run 1 hour straight.. no more is necessary. keep the same pace throughout.. for this i recommend finding a trail to hit to keep yourself entertained as you run
2. 1.5 mile sprint. find a track or a treadmill for this and run a strong pace
3. hill work. running up hills
interval training is what is used by sprinters, I do not recommend this unless you are a very advanced runner.. it can lead to overtraining