Successful athletic coaches Vince Lombardi and James Counsilman implemented the following code to great effect. Their belief was that consistently practicing outward control, leads to a better ability to perform under pressure- which is the key skill of any athlete.
Never show weakness on the outside.
Never to talk negatively.
Never to whine or complain.
To think positively.
To look energetic and confident at all times.
To follow a precise way of thinking and acting after making mistakes.