Question

1) Why do we feel pain or champs in muscles after a
vigorous exercise ?​

Answer 1

Answer:

When muscles are required to work harder than they're used to or in a different way, it's believed to cause microscopic damage to the muscle fibres, resulting in muscle soreness or stiffness. DOMS is often mistakenly believed to be caused by a build up of lactic acid, but lactic acid is not involved in this process.

Answer 2

Answer:

Because it's streaches our muscles and the blood circulation process fastens.