This practice calms him and lowers his energy level so he can elevate his chance of success. Barkley has discovered that the amount of energy flowing through his body can be altered by his thoughts. So, when less energy is required for successful completion, he has developed a strategy that works for him. Altering energy level has also become a device of accomplished golfers.
More energy is required to drive off of the tee than to putt on the green.
Successful golfers have learned how to alter their breathing, and thoughts, to stroke the winning putt. This ability to control breathing steadies their hands and makes their stroke smooth. However, there is no sport where altering energy level is as applicable to success as gymnastics. When the gymnast is racing down the runway, preparing to explode into the vault, she needs to be powered on all cylinders. This is an event of great power.