Because you do too much aerobic exercise, this should be the reason why you can't get fat.

I used to be thin, too, but then I started exercising and groped for a long time. My diet is like this, eat less and eat more, eat 5 or 6 meals a day, and be full at 7 or 8 minutes each time.

Breakfast 10 plus one meal 12 3: 30 plus one meal at 6: 00 and 9: 00-10. I gained 8 Jin in a month. In addition, eat more greasy food, eat less what you like and eat more what you don't like. This is to eat less and eat more. Now that I have just arrived at the gym, I have to adapt to the equipment in the first month, instead of taking part in the equipment exercise immediately.