Winter Running: Running Up Stairs...
There are many benefits of including stairs in your run; your heart rate increases and your muscles work harder, specifically, your leg muscle groups are key to maintaining core stability as well as the stability of your pelvis and lumbar spine.
Find a set of stairs to incorporate in your run for high-intensity, short duration intervals for best results.
StructuralChiro: http://goo.gl/lNju1s