What can be the possible reasons for the pain in her legs?

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Solution

During heavy physical movement muscle cells respire anaerobically producing 'lactic acid'. Accumulation of lactic acid may increase pain.

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Paheli participated in a 400 m race competition held at her school and won the race. When she came home she had mixed feelings of joy and pain as she had cramps in her leg muscles. After a massage, she was relieved of the pain. Answer the following questions related to the situation.
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