The 40% Rule: A Secret to Mental Toughness Gallery The 40% Rule: A Secret to Mental Toughness Personal Development The 40% Rule: A Secret to Mental Toughness By Coach Dris|2020-12-25T11:26:22+01:00October 24th, 2016| 99%of people who start a marathon finish. It’s a surprising number, I know, but there’s a [...] Read More