The first exercise, muscle aches in the next few days. Raise your arm or press the corresponding part, and the pain will be more obvious. How should it be alleviated?

Muscle cell damage, metabolite blockage (lactic acid is one kind), exercise-induced muscle spasm.

Active exercise and training other parts tomorrow can also promote the recovery of tired muscles, mainly aerobic exercise.

Warm-up and relaxation (stretching and massage) can promote muscle recovery and reduce and prevent injuries.

Soak in hot water and take a medicine bath if you have money. It's natural to get enough sleep, only for three or four days.