I have done a decent bit of network and systems administration in the past. I don't like it. It's hard on me sitting at a computer all day. Sometimes I got to go somewhere else and play with some equipment for a bit, but it was mostly a sit at a desk and stare at a screen kind of job. I really need the physical activity. Nowadays I repair rental houses for a number of property owners around here and I'll never go back, even if does pay a little less. I don't really find the work any more or less enjoyable overall, but I work less hours which means I have more time of my own, I sleep so much better at night, and my mental health has improved significantly. Also I get to work by myself which is real nice.
Edit: Many trade jobs are not like mine. I work my own hours, at my own pace, doing mostly light work. Every now and then I might get a helper. I was a roofer when I was much younger, and that's not something my body could handle anymore.
In software, someone with their own software consultancy or an indie app developer could be equivalent.
"Constant need to stay up to date" is actually one of the things I really like about this field, because it's one of the things that prevents the work from getting redundant, at least in the long run.