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The height vs weight chart is screaming for a linear regression line.

The point of which would be pointing out that morbidly obese or underweight people don't make world-class athletes?

Depends on the sport. Chris Froome, for instance, is one skinny dude: http://inrng.com/2014/06/the-moment-the-race-was-won-2014-da... - he's the one in the yellow jersey in the 3rd picture.

He's not exactly winning many sprints. Checking out UCI World Ranking #1's on the graph, they're reasonably in the middle.

agreed