Question

what is the reason for getting pain after vigorous exercise?

Answer 1

hey mate
it is our muscles
as they are contracted very much and don't get to relax they are trying to adapt themselves to the new behavior of the body so it starts to pain because a lot of energy is used up doing so..
hope it helps
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Answer 2

after vigorous exercise, the accumulation of lactic acid in your muscles causes the pain.
when you rest after your exercise, your lactic acid levels in your muscles come to normal and you feel relieved from the pain.
hope this helps you
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