The steroid arrives in blood very fast and the disintegration period is very short. The Methyltestosterone is a steroid with a strong action because of its significant androgen effect. It is used especially when the aggressiveness has to be increased. The weightlifters use it before trainings and before important competitions because the androgen effect is observed after only one hour, befriending the aggressiveness, the overvaluation, the motivational impulse; these effects help them to lift more weights.