Sally Jenkins:
Well, there's a lot of purposeless activity, a lot of meaningless activity with no real measurable improvement.
All the people I talked to for the book, whether it was Peyton Manning, the Hall of Fame NFL quarterback, or Steve Kerr, the coach of the Golden State Warriors, they work with a purpose. They diagnose a weakness and then they attack it.
Peyton Manning, for instance, early in his career had some unstable feet under pressure when heavy defensive linemen would dive below his knees. So one of the things that his coaches did with him was, they started hurling heavy sandbags at his feet in practice to get him a little more stable under pressure.
Those are the sorts of granular things that athletes do to work on things that are really kind of marginal weaknesses, but make an incredible difference under pressure.
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