FitDeck Exercise Playing Cards for Guided Workouts, Navy Seal Designed to drastically improve total body strength (back, arms, fingers, and core) Contains illustrations & instructions describing 18 different Navy-SEAL inspired exercises Many exercises are extremely challenging and may be difficult to master Majority of cards focus on upper body (purchase FitDeck Bodyweight for additional exercises) Intended for a narrow range of users who operate at high levels of fitness and motivation