As long as you persist, you will be fine. You are now in the first round of weight loss and fitness, and you are suspected of fat dehydration. Now, due to the sudden increase in exercise, the body is short of water, and it will appear very relaxed, so drink more water. Eat some fruit. If you are not afraid of bad taste, you'd better add some salt. Well (expressing hesitation, etc.) ... Anyway, as long as you keep exercising, it will be beneficial and harmless. Don't worry.

I used to be a civilian, so I know a little, hehe.