There is a limit to the muscle weight that bodybuilders can increase every month, even if the training nutrition is perfect. The most authoritative academic organization of sports medicine in the world, Strength Training Guide of American College of Sports Medicine, points out that the limit of muscle weight that adult men can increase every month is between 1-2 pounds, which is about 0.45-0.9 kg per month. For the convenience of calculation, let's calculate it as 0.5- 1 kg muscle per month. In other words, everything is perfect, and the maximum muscle gain in one month is 1 kg, which is about 2 kg. However, this does not mean that you should only gain 1 kg every month during the muscle gain period.