PLUS: Hal Higdon's Base Training--Advanced: This Base Training Program for Advanced runners was designed to bridge the three-month gap between my Winter Training Program and the start of my 18-week training programs leading to a fall marathon. Its goal is to show very experienced runners how to develop a base to help them achieve peak performance. Although it works best in spring, you can use it any time of year you want to focus on fitness and conditioning. Regardless of when you use this program, each day I will send you email messages telling you how to run and offering training tips. For more information and direction, visit halhigdon.com.