Nadal attributes his exceptional movement and footwork, particularly early in his career, to practicing with extremely high intensity. He emphasizes running for every ball, even those seemingly out of reach, as this habit trains reaction time and improves the ability to return difficult shots. He criticizes players who don't chase balls when the opponent misses, stating that overall intensity, not just specific drills, is the key differentiator for improvement and mental alertness.

Impact: High. This principle of relentless effort on every ball, regardless of perceived outcome, is a fundamental lesson in dedication and maximizing potential on court.

In the source video, this keypoint occurs from 00:04:39 to 00:07:31.

Sources in support: Rafa Nadal (Tennis Player)