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Fred Duncan
@Fred__Duncan
I’ve posted a lot about isometrics, now it’s time to highlight the other contraction I highly value in athletic preparation…eccentrics.

In The Art and Science of Sport Preparation, I dive into how and why we use eccentrics throughout the program, EQIs, tempo eccentrics
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Fred Duncan
@Fred__Duncan
and even faster eccentric work. Here’s how I tend to think about them.

1. Eccentric Quasi-Isometrics / Long-Duration Eccentrics

Slowest, high time-under-tension, Emphasizes structural adaptation and control

2. Tempo Eccentrics

Introduces controlled movement under submaximal
Fred Duncan
@Fred__Duncan
load, high demand on movement quality and internal cueing, but still slow enough to emphasize position and tissue tolerance. Prepares athletes for more intense eccentric stress.

3. 2/1 Eccentrics / Supramaximal Work

Intentionally surpasses concentric ability, Mechanically
Fred Duncan
@Fred__Duncan
taxing, works well before you introduce fast or reactive eccentric tasks.

4. Extensive Jumps

Lower amplitude, higher frequency, rhythmic jumps. Introduction to SSC work, good bridge into higher-velocity work while building rhythm, control and volume.

5. Fast Eccentrics
Fred Duncan
@Fred__Duncan
High eccentric RFD, deceleration, likely belongs after you’ve built baseline coordination and control

6. Intensive Plyometrics / Shock Method

high force, high amplitude, fast GCTs. Depth jumps are known for extremely high eccentric loading. Typically seen as most intense.
Fred Duncan
@Fred__Duncan
To see exactly how I program this, check out any of my pre-set speed programs.

fredduncantraining.com/product/the-ar…
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