Third, the intensity of the exercise is not up to standard, LSD - long distance slow running, which is your common form of exercise, of course, also includes a long period of slow climbing, slow swimming, slow cycling, your exercise heart rate is very low, the effective fat-burning interval in the 140bpm or more, the heart rate is low leading to low respiratory rate, respiratory rate is low leading to insufficient oxygen uptake, low respiratory rate is low leading to insufficient oxygen uptake, low respiratory rate is low leading to insufficient oxygen uptake. The low heart rate leads to low respiratory rate, low respiratory rate leads to low oxygen uptake, low oxygen uptake you still do what aerobic
Fourth, a single exercise mode, you should be from 2000 to now, adhere to the 17 years of pure aerobic, your body has adapted to your exercise mode and dietary patterns, calorie intake and expenditure on the basis of your current habits, to achieve a balance, so no matter what you do, it's impossible to lose weight, but not easy to get fatter.
The final conclusion is that it is not that exercise is not for you, it is just that you are doing it wrong