Strength Stack 52 Expansion Deck THE EXPANSION PACK contains an additional 51 bodyweight exercise cards to provide more variety to the original Strength Stack 52 Deck. The Expansion Pack exercises are generally more difficult and advanced than those in the original Strength Stack 52 deck. 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 over 50 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.