This is not true. Most hotels have some sort of workout room with at least a hamster wheel. It may not be ideal, but it's better than nothing. Even in the absence of a workout room, unless you're stuck in a blizzard you can go for a run outside and do other exercises without weights. I even take resistance bands on trips. They don't take up much space at all in my suitcase.

There's a CA in PHX who takes a completely collapse-able road bike on trips. It folds up and fits in a bag, and he rides all over the place on overnights. He was telling about all of the different gyms and swimming pools he uses for workouts on all of the PHX overnights. You may have to get creative, but there's a way to get it done.

I agree though that sometimes the dining options can leave a lot to be desired. I take a cooler to work so I always have a healthy option.