Effort and tension
It’s counterintuitive. One would think that strong, athletic motion is about tense muscles. But really, it’s about looseness, posture, and form. Exertion, yes. But selective exertion. Judicious stress.
Our best efforts do not come from globalized tension. Rather, they come from an overall calm paired with highly localized, intentional strain.
Focused effort atop an overall ease.