As a senior three, we should combine work and rest, and exercise when it is time to exercise. In fact, it is strange why senior three will be fat. Personally speaking, I have never been fat in senior three because of too much pressure and too much mental work. How does the body accumulate energy? Maybe it was my high school holiday and the food in the canteen was not so good. Maybe you are different. In fact, in your situation, you can make a plan and plan your time. For example, if you exercise for an hour in the afternoon, you can lose weight and relax at the same time, so that you can be more energetic in the next study. You don't have to worry about a lot of time in this hour.