Would someone have a different fast/slow twitch muscle ratio in their chest versus their legs?

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In short yes, the percentage of slow/fast fibres will vary with muscle group. Pectoralis major tends to be about 60% fast-twitch fibres. "Legs" is a bit of a generalisation - your soleus, in common with other postural muscles, is predominantly slow-twitch fibres, other leg muscles contain more fast-twitch fibres (taken from this study):

  • Soleus 70% slow-twitch
  • Vastus intermedius 47%
  • Gastrocnemius 50%
  • Vastus lateralis 32%

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