The internal force of matter is a force of resistance

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This requires that we can accurately grasp the timing of foot landing buffer and pedal extension in running kinematics analysis..

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When running on the way, the human body has a great forward inertia

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If a fast runner wants to stop immediately, he needs the human body to make a resistance to movement changes

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The inertia of human body in motion is often covered up by the influence of friction and air resistance

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It is very important to make full and rational use of inertia in running

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However, when the human running foot lands on the ground, the rotation is not a rigid body rotation

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The principle of inertia is one of the basic principles in classical physics

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Through this force, every object, whether stationary or moving forward at a constant speed, tries to maintain its original state

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The degree of this resistance is directly proportional to the mass (weight) of the human body

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At this time, what the human body needs is a stable to the pace

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Another form of inertia is rotational inertia (moment of inertia), which is the property that a rotating rigid body maintains its state of uniform rotation

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The principle of inertia described in Newton’s first law of motion: an object that is not affected by any net external force moves at a constant speed, so the object will continue to move at its current speed until a force changes its speed or direction

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The human body is a motion chain, and the moment of inertia will accelerate and transfer upward

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It does not need too much backward pedaling force to accelerate, but a downward pedaling force to make people soar and overcome gravity

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In order to run brisk, coordinated and relaxed, we need to be good at using inertia

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When the running foot lands on the ground on the way, the total center of mass of the human body changes from translational motion to rotation with the supporting foot as the axis, and the translational inertia is transformed into rotational inertia

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For example, inertia needs to be used when “running naturally”, and inertia also needs to be used when mastering speed change and rhythm change

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The task of running on the way is to maintain and stabilize the speed

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