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.

> We already know that exercise is associated with multiple health benefits in humans, including those observed on reproductive health, but few studies have looked at how occupational factors can contribute to these benefits

It seems like a fairly predictable confirmation. It wasn't a given though, exercise tends to improve long-term wellbeing, while lots of people with physically demanding jobs are pretty much destroyed by them.

There's been a lot of reporting on how testosterone and sperm count levels are decreasing without a clear explanation on why and lots of hypothesis so finding clear links between sedentary jobs and fertility is interesting.