The body begins to produce more cortisol, a stress hormone, after sixty minutes of working out. Extra cortisol may block testosterone and your efforts at muscle building can be wasted. To get the best out of a workout, try limiting them to sixty minutes.Testo Drive 365Try training your opposing muscles in a single workout, such as your chest with your back, or your hamstrings with your quads. This method allows one muscle to recover while the other is in action. As a result, you can increase your workout intensity because you are limiting the amount of time that you have to spend in a gym.