Formerly known as jump training, plyometrics are exercises developed to increase your vertical leap. The words plyo and metrics actually stand for measurable increase.
Plyometrics links strength with the speed of the muscle to produce power. Plyometrics are exercises designed in a way to enable a muscle to reach maximum strength in the shortest time possible.
Muscles respond to chemical reactions that are sent from the brain. When there is an eccentric movement your body responds without you even being aware.
One thing that has been noticed is how the best jumper of all time are on the ground for a very short period of time before take off. This is because your body can actually lose power the longer that it is on the ground.
Plyometrics focus on teaching people how to use the energy in their legs to jump higher. Focusing on being on the ground for less time will increase how high you jump.
Bending down before take off is often referred to as the loading phase. This loading phase is crucial to jumping higher because it gives the muscle more power.
Muscles can be compared to rubber bands to an extent. A stretched rubber band will go farther than a non-stretched rubber band.
Think about when you knee tendon is tapped and your leg kicks. The tendon was stretched which caused your muscles to react with a lot of power just as they do in the load phase of a jump.
A muscle contraction is always fastest if stretched prior to contraction. Sadly, training does not increase the speed of the reaction, but it does increase the strength that the contraction will have.
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