Generally speaking, it takes one to two hours at a time, because after more than one and a half hours, the hormone content in the human body will begin to decline, which will lead to fatigue during exercise, which will lead to irregular movements and increase the probability of injury.

If you want to exercise for a long time (more than one and a half hours), you can take BCAA branched-chain amino acids or creatine during exercise. These two drugs are harmless to the human body, but they can effectively improve your attention, strength and endurance during exercise. Of course, you can also take testosterone (practice for eight hours every day, and you must take a lot of testosterone to maintain the hormone content in your body). When I said earlier, the decrease of hormone content in your body means the decrease of this hormone, but you should pay attention.

In view of your situation, you are already very thin. It usually takes an hour to an hour and a half at a time before your muscle content is not very high and your body circumference is not very large. You don't have to worry about the saying that the more you exercise, the thinner you get, because the muscle growth brought by equipment exercise will definitely bring about an increase in circumference, which means that you will definitely become stronger. Moreover, it can be combined with high-content carbohydrates in the diet, such as pasta, steamed bread, potatoes, coarse grains, etc., which helps to strengthen muscles.

Hope to adopt