powertraining for 800 m runners.

A friend of mine runs 1.51 for 800 m. He wants to get faster through sprinttraining and powertraining.
I need a program POWERTRAINING and SPRINTTRAINING to get quicker on the track for a 800-1500 m runner!!!
Is it too simple to lower the intesity and to do more reps of a real sprinting program?
How can he avoid losing his aerobic skills?
Do you know emailadresses or forums of middistance coaches?