Exercise Cards Duo Pack: Strength Stack 52 Bodyweight Workout Playing Card Game. Designed by a Military Fitness Expert. Video Instructions Included. No Equipment Needed. At Home Training Program. THE DUO PACK contains the original Strength Stack and the Expansion Pack for a total of 102 bodyweight exercise cards. 100% MONEYBACK GUARANTEE: If you dont love Strength Stack 52 fitness cards, we will refund your money. REALLY EFFECTIVE: Stack 52 bodyweight exercise cards are used by the US Military and were created by a scientist and military fitness expert. The US Army gave Sergeant Volkin a medal for the exercise programs he designed for the troops. FITS YOUR LIFESTYLE: Play anywhere at any time. You will get the best results doing mini-workouts (5-15 minutes) a few times each day. No planning or preparation, just take out the cards and play a game. The difficulty is progressive. You can start at any level and advance to elite strength and fitness. FUN & MOTIVATING: Games and competition make exercise fun. Play by yourself or compete with your friends, spouse, or children! No more boredom. There are 102 different body weight exercises; you will never do the same workout twice. EASY TO GET STARTED: No equipment, No planning, No memberships. You can play anywhere. Scan the workout cards with a smartphone for online videos of Sergeant Volkin demonstrating the exercises. Visit our website for dozens of free card games and instructional videos.