Use the following Scale values: 0% - 130% - 70% - 120% - 80% - 110% - 90% - 105% - 100% Keep the interval between the keyframes as follow: 4 - 7 - 9 - 11 -12 -13 -14 - 15 Add Motion Blur for a smoother effect Tutorial by Stefano Virgilli, Adobe Certified Instructor and Adobe Certified Expert in Adobe After Effects version 7, CS3, CS4, CS5 and CS6