Bill Hartman 41:10–43:35
Well, okay, so you're a big bag of water. Let's just make it really, really simple. You're a big bag of water. If you've ever, for instance, we have these as tools in the gym now where we have the big water bags and stuff. All you have to do is swing one of those big water bags around. That's happening inside of you all the time. The force that is produced has to be accounted for because number one, it allows you to do amazing things like walk on two legs, throw a baseball 95 miles an hour, jump really, really high. Those internal dynamics contribute to our ability to perform. They are also detrimental to performance. If we can understand a little more about how those internal forces interact with our ability to manage them in an environment based on gravity, space, and the external forces we have to manage, if we can understand that we have stuff going on the inside and stuff going on the outside, it provides a better representation of reality. We can't see it, but we can get close to it, and it allows us to make better decisions in regards to our interaction. It gets us away from things that appear to be entirely superficial. When you see somebody, like a volleyball player doing a box jump—they jump off a box and land—there's a certain way they land. Some people will say, 'Oh, she has weak this.' When we see something happen, like somebody's knees moving down and inward as they land from a jump, they say, 'Oh, she has a weak something.' Actually, when you hit the ground like that, your guts come second. Your body falls first, your guts follow, because they float. When you hit, there's another hit coming. If you don't manage that, you have to be able to capture that force as well. People use these strong versus weak representations. If we can understand that we have management of internal forces that are beneficial or detrimental depending on our perspective and what we're observing in context, if we can learn how to manage those more effectively, our decision-making process becomes much more accurate and much more useful.
internal dynamicsforce managementmovement analysisbiomechanicskinetics