Conventional wisdom has us convinced that high reps and light weights builds muscle endurance and makes little contribution to gains in muscle mass. However, is this a valid perspective? Well, to determine if heavy and light weight training cause different effects, we need to look at the research. After reviewing the research out there, it seems that using heavy or light weights actually doesn’t matter much in terms of hypertrophy. Studies show that muscle growth tends to be equal despite using light weights or heavy weights (high rep vs low rep). Watch this video for a full explanation.