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Get the low-down on fast and slow-twitch muscle fibers. The difference between the two, how they impact your training, and why it’s important to train fast-twitch fibers with intensity as you age.
You have two main types of muscle fibers – those adapted to strength and power and those best suited for endurance activities. You’re born with a certain ratio of these fibers, and the ratio you have may be a factor in how strong you are or how much endurance you have – but are these fibers “fixed” or can you change the ratio through training? Find out what research shows.
