Question

how does lactic acid from your body

Answer 1

When you exercise, your body uses oxygen to break down glucose for energy. During intense exercise, there may not be enough oxygen available to complete the process, so a substance called lactate is made. Your body can convert this lactate to energy without using oxygen. But this lactate or lactic acid can build up in your bloodstream faster than you can burn it off. The point when lactic acid starts to build up is called the "lactate threshold.

I hope this will be helpful for you.

Answer 2

When we exercise we realise o2 with the pressence of glucose which reacts and forms lactic acid