So let's use this course to spur growth in building muscle tissue. Let's take an demonstration of a six-week training cycle. T Volve Your body can only stand so much 'offense', or high intensity, from your workouts. Throughout the first fortnight of high-intensity training entire body adjusts its defenses to compensate for the offense. In weeks 3 to 5 your body adapts towards offense by gaining muscle mass. At about week six you hit the wall, or a plateau. Overtraining and exhaustion set in as cortisol levels creep up and fight your Testosterone Booster levels.