I don't know why the more I exercise, the more tired I get recently, especially when I get up the next day. I am very tired and don't work hard. Going to the gym, the coach said it might be sub-health. I don't know how often you train.

How do you sleep and eat?

All of the above may lead to more and more fatigue.

therefore

Training intensity and time should be moderate: it is recommended to cycle once a week (if you don't need to go to work, you can cycle twice)

Get enough rest, sleep for more than 8 hours, and don't stay up late.

Eat more high-protein foods and antioxidant fruits and vegetables.

I hope I can help you.

At present, I suggest you stop training first, look at the reasons from the above aspects, and then train after improvement.