In order to run faster, a person must increase their leg strength and strength of their cardiovascular system. Find out how to incorporate interval training into an overall routine with help from a fitness trainer in this free video on health and staying in shape. Expert: CarolAnn Contact: www.StudioGroupX.com Bio: CarolAnn has 19 years of professional fitness training experience and holds a master's degree in exercise science and health promotion. Filmmaker: Christopher Rokosz