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Fred Duncan
@Fred__Duncan
Most people think sprinting fast is just about force. It’s not.

At max velocity, ground contact times are under 0.12 seconds, you don’t have time to impart max force, you have to apply it instantly. That’s where stiffness and jerk come in.
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Fred Duncan
@Fred__Duncan
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Fred Duncan
@Fred__Duncan
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Fred Duncan
@Fred__Duncan
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Fred Duncan
@Fred__Duncan
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Fred Duncan
@Fred__Duncan
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Fred Duncan
@Fred__Duncan
Jerk = the rate of change of acceleration.
It’s not just about producing force, but how fast you produce it.
High stiffness + high jerk = high output in a small impulse window.

fredduncantraining.com/product/the-co…
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