Winter is a good time to gain weight, and it is inevitable to always sit and gain weight. What you need is aerobic exercise three to five times a week. You can consider going to the gym to get a long-term card and exercise. Or let yourself be diligent, and watch videos of office yoga and aerobics on the Internet to learn simply, which is also very helpful. Then there is diet, pay attention to control the intake of carbohydrates, eat more fruits and vegetables, and don't eat anything including milk two hours before going to bed. I hope these can bring you some help and make yourself move!