Looking for a challenging exercise ball workout that really works Tired of doing the same old routine We designed Exercise Ball Stack 52 for you. We put 52 of the most effective Swiss ball exercises on playing cards. Deal yourself a workout or play a game like Fit Poker or Cheat with your friends and have the time of your life getting in the best shape of your life! Fit Poker: Bet and perform exercises instead of chips! Cheat: Get caught lying, and you do the exercises on the cards you pick up! About Stack 52 and founder, Sergeant Volkin Our mission is to make exercise fun and accessible for everyone. Sergeant Volkin has a master's degree in science, has authored 5 books, and has over 20 years of fitness experience. The US Army awarded Sergeant Volkin a medal for the fitness programs he designed for the troops. Stack 52 exercise games have been sold in over 24 countries. What's in the Box: Exercise Ball Stack 52 contains 55 cards. There are 8 different colors with each color representing the dominate muscle group worked: 11 Leg exercises (yellow) 2 Arm exercises (orange) 7 Chest exercises (green) 1 Shoulder exercise (purple) 3 Back exercises (pink) 15 Abdominal/Core exercises (red) 5 Cardio exercises (blue) 8 Full body compound exercises (brown) 2 Instructional Cards 1 Wild Card Recommended Equipment (Not Included): 1 exercise ball (also known as a balance ball, stability ball, Swiss Ball, gym ball, or Fitball)