>As for physical activity, that's a lifestyle choice and has nothing to do with working in tech.
That's not entirely true. A lot of jobs have some degree of physical activity, be it walking around or lifting things. In tech, employers would be happy to strap me to a chair physically if they could, instead they keep me so busy I might as well be strapped to a chair.
There's the other extreme with roles that require regular heavy lifting and bending over that leads to long term health problems like back issues, say home electricians crawling around or construction workers.
There's a lot of in-between with jobs that have a healthy amount of lifting and moving around. Tech isn't one of those. That means you have to make up for it by exercising on your own time, not during time you're getting paid. Things like extra cardio you might not need otherwise.
The benefit is that since you're so sedentary, you get almost full control over the choice and amount of exercise you want. The one downside is its all on your own time. For me I don't mind it, other than the cardio I have to do I wish I didn't.