- Do you want convenience and speedy results? 30 DAYS Challenge Journal is your companion during your 30 days diet and exercise program. It's your motivating planner for a successful change in diet and a daily companion on the journey to more health! For daily filling out and documentation of nutrition and exercise. Paperback: 70 pages Author: Dr. Betty Fox Language: English ISBN-10: 1545355185Paperback: 100 pages Publisher: CreateSpace Independent Publishing Platform; Jou edition (April 14, 2017) Language: English ISBN-10: 1720313792 ISBN-13: 978-1720313793 Product Dimensions: 6 x 0.2 x 9 inches