The difference between fast-twitch fibres and slow-twitch fibres

• Fast-twitch fibres have a more powerful force but fatigue quickly.
• Slow-twitch muscle fibers are less powerful but more fatigue-resistant.
• Our muscles contain both types, but your personal ratio can vary.

A 2020 study found that runners with more fast-twitch muscle fibres were more likely to suffer from short-term performance dips after periods of higher-volume training. It means that if you’re a fast-twitch athlete trying to push the same training as a slower-twitch athlete, it may actually make you get slower.