First, you need to walk in an aerobic environment, that is, outdoors. Second, don't walk too slowly, just 8-9 minutes/km. Try not to stop to rest, breathe evenly, and don't speed up and down. Third, don't eat too much at night. It is recommended to give priority to vegetables and coarse grains. Fourth, don't drink water immediately after exercise. You can drink water slowly after about 15 minutes. It is forbidden to drink sugary drinks such as carbonated drinks. Fifth, it is suggested to hold it around 8 pm.
The function of yoga is to shape. After aerobic exercise, you can do yoga for half an hour, which helps to keep fit.