Not a day that goes by… Anyway… Here is why a leg press, squat, conventional deadlift, sumo deadlift, hip thrust OR ANY EXERCISE with hip extension and knee extension occurring at the same time will NOT grow the hamstrings.... I don't know if this will ever going away because even when you present people with the biomehanics about this they still argue because they don't have the brain capacity to learn new information. It is due to antagonist inhibition. Antagonist inhibition is a spinal reflex where activation of the agonist muscle (the prime mover) automatically inhibits the antagonist muscle (the opposing muscle) so they don't fight each other during the motion. This allows smoother, more efficient movement. It works like this: When the agonist contracts, its muscle spindles (Ia afferents) send signals. These excite Ia inhibitory interneurons in the spinal cord. Those interneurons then inhibit the alpha motor neurons of the antagonist muscle -> antagonist relaxes. So when there is an antagonist joint torque created during a two joint muscle exercise, that muscle has to relax and allow the true agonist muscles to do the work. This is why.. - the long head of the triceps doesn't grow in a press - the rec fem and hamstrings don't grow from leg press, hip thrusts, squats, deadlifts etc - the gastroc during squats and leg press Facts don't care about your feelings on this
