Twitch is a term used for:

Twitch or muscle twitch is a term used for muscle contraction.

Most muscles are made up of two kinds of muscle fibres that help you move your body:

  • Slow-twitch muscle fibres move more slowly but help to keep you moving longer
  • Fast-twitch muscle fibres, which help you move faster, but for shorter periods

Slow-twitch muscle fibres use an aerobic energy system. Fast-twitch muscle fibres don’t need as much blood because they make their own quick source of energy.

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