Great informative article that compares heel strikes versus forefoot strikes. Learning to correct your foot strike may not be easy at first – Jeremy suggests exercises such as butt kicks and high knee drills. Your core also needs work – he further suggests strengthening your core with exercises such as the plank, half-kneel stretch and single leg balance.
http://www.silive.com/healthfit/index.ssf/2013/08/heel_vs_toe.html.