When it comes to maximising muscular hypertrophy, two things are needed: mechanical tension and metabolic stress. Ok, mechanical tension alone might be sufficient to induce the hypertrophic response, but if you want the best gains possible, then you can’t forget about metabolic stress. It’s a nice powerful addition to the muscle building process! So, if your goal is to develop maximum muscle mass, then your training should be arranged in such a way to promote both optimal levels of mechanical tension and metabolic stress. With both, you can’t fail.