It’s the source of energy for contractions of muscles. He will be better in his athletic success if an athlete can increase the quantity of fast twitch muscle fibres and increase the rate of contraction of those fibres. The formula for power in physics is Force (strength) x velocity. Often the muscular velocity is both internal and external. There is a rate of contraction or stress of the muscles (internal) and a rate of external movement. Both examples of internal isometric contraction without external motion are the clenching of your fist or the contracting of your abdominal muscles bracing for a blow. If you would like to learn more about this, please check out Newell Strength.
The power of speed can be broken down into three parts:
Starting Strength: This is the force first created by a muscular contraction in the first split second. Think of the precise moment a sprinter begins to drive the starting block off. This includes alertness and behaving when the instinct is required at the exact moment.
Explosive Strength: The overall rate at which force during a movement is sustained. To step off the block and accelerate, think of a sprinter using all their continuous power. Think of a running back ploughing a pair of tackles behind him into a defensive line. He just continues to travel.
Reactive strength: When a muscle group first stretches and then quickly contracts as in jumping, it is often called reversal strength. For this element, plyometric training is employed. There is a moment when a stretch or myotatic reflex that actually contracts the muscle is triggered by the stretching itself. When the muscle group begins to shorten, so there is a turn around. The coupling time is called the small amount of time taken to adjust the polarity of motion.