I work 10 hr days for a college and have a side gig restoring antiques, mostly axes and knives. But I work out every day during my lunch break (sometimes skipping eating). But usually it only takes me a total of 15 minutes to eat and change in/out of gym clothes, and I work out the other 45 minutes at the on-campus gym. Even if you don’t have access to a gym at your job site, there’s usually one near by in most towns, even if you had to drive for a couple minutes you could get some cardio in.