Home / Unbreakable Spartan Training Fitness Test: Are You Fast or Slow Twitch? Find Out. By The Spartan Editors · November 25, 2020 Share Facebook Share on Facebook Tweet Tweet on Twitter Pin it Pin on Pinterest Whatsapp Share on Whatsapp Email How muscle-fiber types impact performance: take the test to train your slow-twitch or fast-twitch tendencies to build speed and power, and improve weaknesses. Bodyweight Mind and Body Spartan Fit app SpartanFit App Strength Training The Spartan Editors We're building a better world by empowering people to eat, think, and live like a Spartan. Join us.