It depends on what kind. Some are useful, others are useless at all. As long as you are not very fat, you don't want to lose weight. Taking part in outdoor activities is good for your health. However, if you think it is still too much trouble, there is a way to learn from Baidu's article "Happy and Thin Autumn", which may be helpful to you. Personal suggestions that are helpful to you can be adopted, and those that are useless to you can be skipped.