Which of the following activities would predominantly use fast-twitch muscle fibers?

• A. Cycling at a steady pace
• B. Sprinting
• C. Marathon running
• D. Yoga

Answer: (B)

Verified step by step guidance

1. Understand the characteristics of fast-twitch muscle fibers: Fast-twitch fibers are designed for short bursts of power and speed. They fatigue quickly but are capable of generating more force compared to slow-twitch fibers.
2. Identify the type of activities that require quick, powerful movements: Activities that involve rapid, intense exertion typically rely on fast-twitch fibers.
3. Analyze the options given: Cycling at a steady pace, marathon running, and yoga are activities that require endurance and sustained effort, which predominantly use slow-twitch fibers.
4. Consider the nature of sprinting: Sprinting is a high-intensity activity that requires quick bursts of speed and power, making it reliant on fast-twitch muscle fibers.
5. Conclude that sprinting is the activity that predominantly uses fast-twitch muscle fibers due to its need for rapid and powerful muscle contractions.