The 40% Rule: A Secret to Mental Toughness
99%of people who start a marathon finish. It’s a surprising number, I know, but there’s a reason that it’s so high. It’s called the 40% Rule, a concept used by Navy SEALs to increase mental toughness. Spanx you very much In his latest video on Big Think, Marquis Jet founder Jesse Itzler (and husband to [...]