TriLog, now in its fifth edition, is the best training diary available for triathletes adn duathletes because of its many features. They include: Training Diary The 56-week undated diary lets users plan and track swim, cycle, and run training for 13 months. And because it's undated, users decide when to begin using it. Training Guide Over 25 pages of training tips, workouts, and charts provide the basics to the novice and new workout ideas for the expert. All New Full Color Photos This edition features all new photographs: 8 full color and 16 black & white photographs to inspire and motivate all year.Houts, Tim is the author of 'Tri Log Diary and Guide for the Triathlete and Duathlete', published 1995 under ISBN 9781570280542 and ISBN 1570280541.