melatonin whose secretion, low in the day, increases during the night. Prolactin, whose secretion experiences an ascending phase during sleep, and insulin The growth hormone whose secretion is associated with slow sleep at the beginning of the night. To not sleep is to increase our cortisol and our insulin. (Also the person who sleeps least compensates by eating about 300 more calories per day.) Choosing the right time for your workout, planning your sessions and intensity, having an active sexual life, blossoming, avoiding stress, sleeping well and relaxing are the first ways to keep a good rate of Strength Muscles, optimize. In the second part of this article we will see how to stimulate its natural .