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How Do Muscles Actually Get Bigger?

Key Facts In This Video

  1. There are three different types of muscles: cardiac, smooth and skeletal. 00:31

  2. Muscles are categorized into two types: Type I (slow twitch) and type II (fast twitch). 01:13

  3. Lifting something heavy, like a weight, tears muscles apart, then those muscles rebuild themselves to prepare to face that damage again. 01:58