You can try the following methods

1: Stretching can help you make lactic acid flow in your muscles, but it's best to do some aerobic exercise at the beginning.

2: massage! This is the most effective method for many years.

3: Hot bath! It can make blood circulate and let your accumulated lactic acid flow away.

Finally, if you have accumulated lactic acid, it means that the part where you have accumulated lactic acid has not exercised for a long time.