Coming down the court, a player jumps and the laws of physics take over. These laws say that every action has an equal and opposite response. 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. If the player exerts a greater amount of force on the floor, the floor exerts a larger amount of force back. This causes the player to go higher in the air.
If a player is running through the jumping process, his/her center of mass follows a parabolic course, which essentially looks similar to a rounded off mountain peak. A persons "center of mass" is situated close to their midsection. This means that, if the person were to stay in precisely the same position for the duration of the complete jumping action, his/her midsection (and therefore, complete body) would follow this route. However as a player jumps while running, the center of mass is lifted - and manipulated.
One thing that players frequently do is raise one (or both knees) while he is jumping.. He does that on his way up. As he comes back down then, he puts his legs back down. This makes his center of gravity lower. 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 portion of the time in the air, the head stays at the same height, but ,all through 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 one person looks at another, they tend to not look at the center of their body. Instead, we typically look at the other person's head. What happens at that instant is a bit of an "illusion", but it really is happening. The person's center of mass is shifting and this causes his head to stay in the same position for a longer period.
Well, if "hang time" is not real, how is it that one person can continue in the air longer than another person? The only option remaining is that he can JUMP HIGHER! If you can't increase your hang time then, you have to learn to jump higher!
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