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nicolebakercpateache

Well The body converts glucose to energy which produces lactic acid as a by-product. As that builds up in the muscles, it begins causing cramps and fatigue as a signal to stop. So you have to stop when you reach the lactate threshold. And Over the course of a sustained run at half-marathon pace or faster, the amount of energy (and thus oxygen) needed to maintain that pace gradually inches upward. Over the course of 10-20 minutes, your oxygen consumption can drift upward by as much as 25 per cent, making it progressively harder for you to Hold up.

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adefioyelaoye

I would  be unable to run forever without my muscles giving out is as a result

of stress , shortage of glucose and build-up of lactic acid.

When activities are performed by muscle tissues , the glucose is usually

converted to energy with the release of lactic acid.

The shortage of glucose and build up of lactic acid brings about fatigue and

wearing out of the tissues thereby making us unable to run forever.

Read more on https://brainly.com/question/19061532

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