The Great Balance and Stability Handbook is a slim, compact fitness book that is jam-packed with information on how to strengthen your core muscles. It provides well-written, detailed instructions, along with high quality graphics, for exercises using 4 pieces of equipment: the BOSU Trainer, extreme balance board, balance cushion and wobble board. Exercises are color-coded, and focus on different parts of the body. They can also be refined by type (static, dynamic, reactive) and level of difficulty. Easy to understand and use.