David Brooks wrote a great article about how to elevate mental and physical prowess through physical routine. He cites a book by a sports physiologist, H.A. Dorfman.
“Self-discipline is a form of freedom. Freedom from laziness and lethargy, freedom from expectations and demands of others, freedom from weakness and fear — and doubt.”
Structure and repitition shape human thought. Structured practice is the key to mastery in any skill, whether pitching a baseball or giving a speech. We often think that our mind shapes our actions; but our actions also shape our mind.
The whole article is well worth reading. Here’s the link.