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Hang Time - Can It Be Improved?
Coming down the court, a player jumps and the laws of physics take over. These laws state that every action has an equal and opposed reaction. What this means in layman's terms is that the player pushes against the floor and the floor exerts a force back. This action/reaction makes the player to leave the floor. The more force the player uses when pushing against the floor, the more force the floor exerts back - resulting in the player going higher into the air.
If a player is running through the jumping process, his/her center of mass follows a parabolic path, which in essence looks similar to a rounded off mountain top. A persons "center of mass" is located near their midsection. This means that, if the person were to stay in exactly the same position for the duration of the complete jumping act, his/her midsection (and consequently, whole body) would follow this path. However as a player jumps while running, the center of mass is lifted - and manipulated.
By raising his knees, he's raising his center of mass relative to his head. He does that on his way up. On the way down, of course, he lowers his legs back down and that, in turn causes the center of mass to come back down. This in effect raises his head in relation to the center of mass. The head does not follow the parabolic path. The head stays at one height.
So what you get is for a part of the period in the air, the head stays at the same height, but ,during the whole time the center of mass goes up and down.
In essence, the player's head is the key to why we believe in hang time.
When we look at each other, we don't customarily look at the person's "center of mass". We usually concentrate on a person's head (or at least the upper part of the entire body) . What happens at that moment is a bit of an "illusion", but it really is happening. The head stays in the same place for an unnaturally extended time because the person changes his center of mass.
Well, if "hang time" is not real, how is it that one person can stay in the air longer than another person? The only option left is that he can JUMP HIGHER! If you can't improve your hang time then, you have to learn to jump higher!
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