Knock Knock Kids My Fitness Passport (10106) Combat exercise resistance with Knock Knock's My Fitness Passport for kids ages 4 to 8 Official-looking booklet makes an adventuresome, interactive game of trying new things Softcover book with metallic stamping, 48 pages, and 70 fancy stickers to stamp passport pages as a reward 4.5 x 6 Inches; also look for the My Food Passport Knock Knock helps you inspire little ones to try healthy new things