Question

Why there is pain in muscle after during vigorous physical exercise?

Answer 1

during vigorous excercise there in not proper amount of oxygen in the body os some muscles start anerobic respiration so lactic formation gets start so lactic acid deposits on muscles this situation is called as cramps

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Answer 2

this pain is known as muscular cramp which occurs due to the accumulation of lactic acid. actually, when we do hard work , our muscles require more oxygen to produce energy for doing work . because of hurry or other cause the the the sufficient amout of oxyfen don't get supplied to the muscles. due to which the muscles start producing energy through anaerobic respiration. & as a byproduct the lactic acid also forms in the muscles with energy . and excessive accumulation of lactic acid causes severe pain.