The Instinct of Will: How Self-Control Works, Why It's Important, and What You Can Do to Have More of It is a book that examines important aspects of self-control and will. The author of this book, Kelly McGonigal, a scientist and psychologist, shares her research and discoveries about how self-control works in our brains. She explains why self-control is an important aspect of life for success and happiness. In addition, the author offers readers practical advice and strategies that will help increase the level of self-control. This book is a useful guide for anyone who wants to improve their willpower and achieve their goals.