There is no general answer to the question of how much muscle you can build in a month. Two models provide useful guidance values.
Training and the right diet are the key to optimal muscle building. Other factors also play a role in how quickly the muscles grow. Men have a larger proportion of muscle mass relative to body weight than women - around 38 percent vs. 30 percent. They also have more testosterone, which can accelerate muscle protein synthesis by 27 percent. The metabolism of muscle cells changes with increasing age. On average, people lose between one and three percent of musclemass per year and it becomes increasingly difficult to build it up. A beginner following a targeted training program could achieve muscle gain of about 9 to 11 kilograms total, or 900 grams per month, in the first year. After this first year, however, the growth rate drops significantly: to 4.5 to 5.4 kilograms in the second year and only 2 to 3 kg in the third year. The best way to build muscle is to do strength training regularly.