To help build strength and power, add stair climbing to your training regimen.
Stair climbing forces you to work against gravity, giving you a plyometric workout and strengthening your glutes, calves, and quads, which will help you in the later miles of a run.
Read more at http://www.broadwayworld.com/bwwfitness/article/Fitness-Tip-of-the-Day-Climb-Stairs-for-Improved-Running-20140313#UsDet8lS0Z8q3b5r.99