@Fred__Duncan: At matched velocities, sprinte...

At matched velocities, sprinters and soccer players have similar contact times, but sprinters produce more horizontal power, keep force oriented forward, and attenuate braking more effectively.

The eccentric capacity piece is the most interesting part. It doesn’t create speed

per se, it determines how much braking force you can attenuate without it bleeding into your propulsion. Build that capacity and you stop leaving speed on the table.

Speed Kills breaks down exactly how to develop these qualities, 80+ pages plus an 8-week sprint program built

around force production, sprint mechanics, and the training methods that actually move the needle.

fredduncantraining.com/product/speed-…

In a study of elite US 100m sprinters, step length was the single strongest predictor of maximum velocity, accounting for nearly 45% of the variability in males and 40% in females. Contact time wasn’t significantly correlated with velocity at all.

Bolt is a great example.