DAVID GOGGINS: HOW TO BECOME THE TOUGHEST MAN ALIVE. Lesson 1: Purpose Trumps Motivation. David Goggins doesn't believe in motivation. ... Lesson 2: Deconstruct Things. ... Lesson 3: Remember The 40% Rule. ... Lesson 4: Mental Visualisation. ... Lesson 5: Use Your Cookie Jar. ... Lesson 6: Be Willing To Suffer. ... Physical Limitations. Jun 13, 2021