This study shows that occupational lifting (moving heavy things as part of a job) increases testosterone and sperm counts, while previous studies were looking a

This study shows that occupational lifting (moving heavy things as part of a job) increases testosterone and sperm counts, while previous studies were looking at lifting weights in a gym. Yes, the earlier studies would certainly imply the later results were most likely true, but that's how science works. And this in turn lends higher credence to those earlier studies.