The longer the exercise time, the better the effect may not be.

As far as low-intensity aerobic exercise is concerned, the proportion of fat energy supply will increase with the extension of time, that is, the longer the exercise time, the more fat will be lost. After aerobic exercise for about 30 minutes, the content of free fatty acids in blood reaches the highest point, and the proportion of fat energy supply also reaches the highest. Therefore, it is generally recommended that moderate-intensity aerobic exercise last at least 30 minutes. High-intensity aerobic exercise consumes less fat. People who aim at reducing fat should do less high-intensity aerobic exercise.

Strength training mainly consumes glycogen for energy supply, while fat for energy supply is low. But that doesn't mean you can't lose weight through strength training. In the process of exercise, the fat burning ability of aerobic exercise is obviously better than that of strength training, but the fat burning effect of strength training lasts for a long time, and even exceeds that of low-intensity training within 24 hours. From this point of view, sometimes half an hour of strength training may be better than an hour of moderate-intensity aerobic exercise.

The longer the exercise time, the better the effect. Another reason is that the longer the aerobic exercise time, the higher the proportion of protein energy consumed by the body. Lose more fat and muscle. Muscle loss, the body's basic metabolism will decline, and it is even more difficult to lose weight.

In addition, too long exercise time will make the body tired and even lead to muscle strain. Long-term exercise makes lactic acid accumulate in the body, causing muscle fatigue, soreness and spasm. So exercise needs a combination of work and rest.

What is the best time to exercise in a day?

How long you exercise a day depends on your exercise purpose. If you exercise to lose weight and fat, you can do moderate-intensity aerobic exercise for a long time. It is recommended to do it for 40 minutes to 60 minutes at a time. The aerobic exercise time after strength training can be shorter, about 30 minutes. If you are not fat, you can do more strength training for about 30 minutes each time just to gain muscle.