Blaž Hrastnik - Musclemania Pro and Slovenia physician says, "Sometimes it’s not the frequency of hitting the muscle you want to develop it can very easily be how you hit it. For example, maybe your execution of the exercises is bad. Or maybe you’re putting too much stress on the muscle so it can’t regenerate. The areas i trained most in order to grow started to blossom when i started working out under an hour-only basic exercises with heavy weight."