Use The Navy SEAL's 40% Rule To Achieve The Impossible. A common obstacle of success in sales leadership is getting stuck in a rut. Worry, fear and doubt are manufactured emotions that can limit a sales team’s ability to achieve their goals and potential. The rut is a comfort zone for you and your organization. Success can still happen in the rut, but according to the Navy SEAL’s 40% Rule, the big wins will never be achieved here.