Sure, but then if we repeated everything we put in our journals someone would accuse us of being boring and repetitive
I have a few aims with my cardio work. One is simply to be better at steady-state endurance activities. This is so that I can save money and help the environment by walking, running or cycling instead of driving. It's also so I can just for pure ego get similar run times to what I got in my 20s.
I also want to have better endurance for interval training, as I've found this helps a lot with doing intense weight training. Doing sprints and cruises on the bike, and sprints and walks while out on foot, this has made me recover more quickly and thoroughly between sets. So I can do more sets in the same time, really blast my muscles.
With greater overall endurance I feel more energetic and am sick much less often. Supposedly this helps us live longer, but I'm less worried about how
long I live and more about how
well I live. I'd rather be energetic and lively and fall over at 65 than diabetic and can't get off the couch at 55 and in a nursing home until I'm 95 and finally fall off the twig.
Lastly, because of my chosen profession, I have to "look the part" as they say. Of course just because you don't follow something yourself doesn't mean you don't know how it's done - footy coaches are not the best players on their team, after all.
But clients are often looking for excuses for their laziness and failure, if the trainer is unfit, weak or fat, the clients will say, "see? see?! They can't do it, how can I?" If I am fit and strong then they have to come up with other excuses instead.