Fitness can also include muscular endurance, which is the ability of a muscle to continue exerting force without tiring.
As mentioned above, strength training builds bigger muscles. Endurance training, on the other hand, does not necessarily generate muscles of a larger size.
This is because the body focuses more on the cardiovascular system, ensuring that the muscles receive the oxygenated blood they need to keep functioning.
Another important change in muscles that people specifically train for endurance concerns the different types of muscle tissue:
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fibers.
Fast twitch fibers contract quickly but get tired quickly. They use a lot of energy and are useful for sprints. They are whitish, as they do not require blood to function.
Slow twitch fibers are best for endurance work, as they can carry out tasks without getting tired. They are present in core muscles. These fibers appear red, as they rely on a good supply of oxygenated blood and contain stores of myoglobin.
Different exercises will promote fast twitch fibers, slow twitch fibers, or both. For example, a sprinter will have comparatively more fast twitch fibers, whereas a long distance runner will have more slow twitch fibers.
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