CanFitPro Personal Training Specialist Practice Test 2025 - Free Personal Training Specialist Practice Questions and Study Guide

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Question: 1 / 445

What is a characteristic of slow twitch muscle fibers?

Produce a great deal of force quickly

Contract quickly and fatigue quickly

Have a high amount of mitochondria and are resistant to fatigue

Slow twitch muscle fibers have a high amount of mitochondria, which allow them to produce energy aerobically and sustain prolonged muscle contractions. They are also resistant to fatigue due to their high endurance capabilities compared to fast twitch muscle fibers. The other options, such as A and B, are more characteristic of fast twitch muscle fibers, which contract quickly but tire out more easily. Option D is incorrect because slow twitch muscle fibers primarily work aerobically, using oxygen to create energy rather than relying on anaerobic respiration.

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Work only anaerobically

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