Children will lose weight after exercising for about half an hour every day. Generally, if you keep exercising for more than 30 minutes every day and keep exercising for about a month, your weight will drop significantly, but the length of time will be different because of your different physique. Exercise refers to physical activities that can promote good health. It is a set of rules involving physical strength and skills, and it is also a behavioral activity bound by habits, which is usually competitive. The most effective way to lose weight is to do some aerobic exercise every day and choose the time and project that suits you.