David Holt's Marathon Training Guide - Schedule for the 50-60 mile a week runner. USA Fit - Marathon and half marathon training available online and in person in many US cities. State of the Art Marathon Training - Training programs for the beginner to the advanced competitor. Denver Fit - Marathon and half marathon training programs: fun and non-intimidating. Marathon and Beyond - Bimonthly magazine in book form for easy reference: marathoning, ultra distance running and training. Articles from the magazine are available on the website. Be A Marathon Runner! - Train to run a safe marathon and/or improve your times. Three training programs by mail. Gait Scan - Biomechanical Assessment and Sports Injury Prevention: discover the most appropriate method to improve and support the way you run to prevent injury. Marathon Rookie - How to train for a marathon or half marathon. Runner's Edge of the Rockies - Group marathon training in the greater Denver area. Weekly training runs including aid stations. Coaching support for all levels. A 21 Week Marathon Training Program - Designed for runners who need a lot of rest, or who can only run 4-5 days per week.