Usain Bolt has a clear image of how his final race will play out
(LA Times Clippers)

Think of the man as pure physics, that tall body like a math equation, cadence multiplied by stride length. Or consider that something less measurable has propelled Usain Bolt to greatness, something along the lines of talent blended with grit. `Unbeatable,` he told reporters this week. `Unstoppable.`...