Hello, excessive fatigue in fitness will damage the liver, and moderate exercise should be beneficial. 220 minus your age is your maximum heart rate, the exercise heart rate should be controlled within 80% of the maximum heart rate, and the exercise time should not exceed one hour. I don't feel too tired after exercise, and I won't affect my sleep that day. I can recover from fatigue in a day or two.

I hope I can help you, thank you!