Relentless by Tim Grover is a book about the mentality of those who are unstoppable in their pursuit of perfection. 

Tim Grover is a sports psychologist who primarily works with NBA players, most notably, Kobe, Dwayne Wade, and Michael Jordan throughout their careers. Grover is a no-nonsense coach who won’t bust his ass for anyone who isn’t willing to put in the work themselves. He believes there are different levels of athletes and people in general which he refers to as Coolers, Closers, and Cleaners. It is only the Cleaner mentality that Grover sees as being Relentless enough to achieve their dreams. People can hone their ability to become Cleaners but it is also a deeply innate characteristic. Just like with Carol Dweck’s Growth Mindset, some people start out with the right mindset for success and others need to put more work into getting there. 

Relentless is a list of rules about the mentality of a Cleaner and how they operate which is interestingly all labelled as #1 because Grover believes that all of the aspects are equal in their importance and should not be ranked. 

The book contains many great stories about the lives and mentality of Jordan, Kobe, and Wade while they were in their prime as well as contains much actionable advice about how to transform yourself into a Cleaner who is relentless in the pursuit of their goals.