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In this video, Jonathan from the Institute of Human Anatomy talks through why some people are naturally better at endurance sports while others excel at explosive movements. In this comprehensive guide to muscle fiber types you will learn the science behind fasttwitch, slowtwitch, and hybrid muscle fibers, how they influence athletic performance, and whether you can change your muscle fiber composition through training.

0:00 0:54 Intro
0:54 1:44 The Basics of Muscle Fibers
1:44 2:32 Fast Twitch vs Slow Twitch Fiber Proportions
2:32 3:20 Factors That Influence Fast Twitch & Slow Twitch Fiber Proportions from Person to Person
3:20 4:15 Defining Slow Oxidative Fibers
4:16 5:28 The Strengths of Slow Fibers
5:28 6:25 Defining Fast Glycolytic Fibers
6:25 7:35 The Strengths of Fast Glycolytic Fibers
7:35 9:38 The Role of... The Hybrid Fibers!? (Type IIa Fibers!)
9:38 10:15 How Your Body "Decides" What Fiber Type to Use
10:15 12:53 Jonathan and Geoffrey's Summary of the Fibers
12:53 16:16 How Training Influences Muscle Fiber Adaptations
16:16 16:42 Thanks for Watching!

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Common Questions
What is the difference between fast twitch and slow twitch muscle fibers?
How does the body decide which muscle fibers to use?
Why do some people have more fast twitch fibers than others?
Can I change my muscle fiber composition with training?
What role do hybrid fibers (Type IIa) play in muscle performance?

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