A better description is that ideas form in the gym, or are poorly cherry-picked from old research, and then mutate through an ongoing telephone game into ... "broscience".
A classic example is "don't squat too deep, it's bad for your knees". It has staying power because squatting deep is hard. If you squat deep, you can't slap as many plates on the bar. The original source is a 1970s study that hasn't really been followed up. But it doesn't square with what's known now about biomechanics (eg shearing is highest at the "safe height"; shallow squatting leads to uneven wear because that's not how the knee is arranged to work etc), or on the statistics on injury and pathology in sports using lots of squats.
Sometimes broscience comes from observations by bodybuilders and sometimes it gets validated. But a lot of the time it's worthy of mockery because it's just folklore with a particularly postural nature.
A classic example is "don't squat too deep, it's bad for your knees". It has staying power because squatting deep is hard. If you squat deep, you can't slap as many plates on the bar. The original source is a 1970s study that hasn't really been followed up. But it doesn't square with what's known now about biomechanics (eg shearing is highest at the "safe height"; shallow squatting leads to uneven wear because that's not how the knee is arranged to work etc), or on the statistics on injury and pathology in sports using lots of squats.
Sometimes broscience comes from observations by bodybuilders and sometimes it gets validated. But a lot of the time it's worthy of mockery because it's just folklore with a particularly postural nature.