A day of exercise about 30-60 minutes can lose weight, and with a reasonable diet, adhere to 1-3 months can see the effect of weight loss. But the specific time varies from person to person. Exercise to lose weight is mainly through swimming, jumping rope and other aerobic exercise to burn off excess fat, in general, aerobic exercise to reach more than half an hour of fat utilization rate is higher, so it is more helpful to lose weight. However, exercise needs to be adhered to, may not be able to see the effect in a short period of time, generally need to continue to exercise for 1-3 months before you can see the effect of weight loss. It is recommended that the weight loss crowd according to their own body to choose their own exercise time. Weight loss in addition to exercise, but also with a reasonable diet, should be low-fat, low-sugar, low-calorie-based, is not recommended to lose weight through dieting, eating diet pills for weight loss, may be detrimental to health.