Seeing is Believing

I believe it was Aristotle who once proclaimed that heavier things fall faster than lighter objects. So sure was he of this idea that he didn't even bother to try it out. It made sense. Why bother? While surely someone else of less import must have noticed the fallacy of this claim, it was Galileo, who famously put this claim to rest.

Although this is nowhere near the import of a test of gravity, I find that I give advice in tennis without actually seeing people do it. The latest advice that I've given that's basically wrong is the the arms come up together. That's not entirely untrue, but it's not entirely true.

What most pros do is this: the left arm tosses, and the right arm comes up, and waits. While waiting, the server eventually bends his knee. It's only after the ball has reached its peak that the player begins to move the racquet down in the back-scratching position, and move up.

So while it isn't exactly, left arm goes up, then wait, then right arm goes up, nor is it both arms up simultaneously, it's more like like left arm and right arm go up, but right arm waits until toss is complete, before moving on.