Glycogen is the primary source of glucose for ATP production in muscles during intense activity that lasts for less than 2 minutes.

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Glycogen is a stored form of glucose in muscles and liver. During intense activity, glycogen is broken down into glucose which is then used for ATP production in muscles. This process can sustain high-intensity activity for a short period of time, typically less than 2 minutes.

Glycogen Is the Primary Source of Glucose for ATP Production