Here's a thought:
"Your ability to generate power is directly proportional to your ability to relax."
I'm actually not quoting Katy Bowman this time, but David Allen, from his book, "Getting Things Done: The Art of Stress-Free Productivity."
And he's not talking about the chillin' on the beach kind of relaxing, but the state of being free from unnecessary tension in themoment of engagement (which Katy actually does talk about regarding muscle and posture and movement, and stuff...)
Early on in the book, Allen refers to the state in martial arts of 'perfect readiness', or 'mind like water'. (If you've been in my qigong classes, you will be reminded here of wu chi...)
He says, throw a pebble in a pond and watch how it responds: "...totally appropriately to the force and mass of the input; then it returns to the calm.
It doesn't overreact or underreact."
Can you imagine living life like that?