Reactive strength is the ability to quickly and efficiently...
Fred Duncan@Fred__Duncan
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Oct 15, 2025
~1 min read
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Reactive strength is the ability to quickly and efficiently transition from an eccentric contraction to a concentric one.
When you think about most sport actions…sprinting, jumping, changing direction, they all come down to how efficiently you apply force.
That includes how
When you think about most sport actions…sprinting, jumping, changing direction, they all come down to how efficiently you apply force.
That includes how
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much force you can produce (magnitude), how well you direct it, and how quickly you can do it (time).
Everything in training should support that equation.
To improve it, you have to understand
the different means we use
the adaptations each one drives,
and how to organize
Everything in training should support that equation.
To improve it, you have to understand
the different means we use
the adaptations each one drives,
and how to organize
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them so they transfer
That starts with understanding contractions, eccentric, isometric, and concentric, and how to develop each so the athlete can maximize what they already have.
From there, it’s about blending it all together
building the physical abilities (biomotor),
That starts with understanding contractions, eccentric, isometric, and concentric, and how to develop each so the athlete can maximize what they already have.
From there, it’s about blending it all together
building the physical abilities (biomotor),
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making sure they transfer to movement (biodynamic),
and maintaining the energy systems (bioenergetic) that let the athlete repeat it consistently.
That’s the foundation of my system.
If you want to see how this all ties together, how we use specific means, contractions, and
and maintaining the energy systems (bioenergetic) that let the athlete repeat it consistently.
That’s the foundation of my system.
If you want to see how this all ties together, how we use specific means, contractions, and
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programming to improve force efficiency and speed, it’s inside Speed Kills (newest ebook/program) and The Art & Science of Sport Preparation.
Both are included in the Project Speed Bundle, education, application, and full training systems in one.
fredduncantraining.com/product/projec…
Both are included in the Project Speed Bundle, education, application, and full training systems in one.
fredduncantraining.com/product/projec…