Maintaining Momentum and Never Zero Mentality

The chapter discusses the importance of maintaining momentum and having a never zero mentality when it comes to training. It emphasizes focusing on what can be done rather than what can't be done, especially in the face of injuries. The chapter also mentions the rule of not taking a day off when feeling tired, but rather postponing it to the next day and still engaging in a workout, even if it's lighter or with higher reps.