Calling it 'the gym' sort of conflates its two distinct sections: the one containing cardio equipment, and the other containing strength training/bodybuilding equipment. So-called 'work capacity' aside, there's almost zero overlap between the two sections.

Whether someone's effectively strength training/bodybuilding or not, which is the section I think you refer to—nobody reasonably believes that does anything significant for cardiovascular health, which is the topic being dicussed here.