Stronger muscles adapted for moving heavy loads over short distances are primarily composed of fast-twitch muscle fibers, also known as Type II fibers. These fibers are larger in diameter and generate greater force, making them ideal for explosive movements like Weightlifting or sprinting. They fatigue more quickly than slow-twitch fibers but are crucial for activities that require strength and power in a short burst. Examples include the quadriceps and hamstrings in the legs, which are heavily engaged during heavy lifting or sprinting.
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