Tim Grover’s Relentless: From Good to Great to Unstoppable is a high-performance mindset guide that explores what separates elite achievers from everyone else.

Through stories from professional sports and lessons from his own career, Grover introduces the concept of the “Cleaner”—an individual who thrives under pressure, embraces responsibility, and refuses to be satisfied with past accomplishments. He contrasts Cleaners with those who are merely good or even great, explaining how the most successful people operate with a relentless drive that pushes them beyond comfort, recognition, and conventional limits. Themes such as discipline, confidence, resilience, and accountability run throughout the book, emphasizing that peak performance requires both physical preparation and a ruthless mental edge. With its direct advice, intense perspective, and insights into the mindset of champions, Relentless offers a blueprint for anyone determined to reach the highest levels of success in business, sports, or life.