It is not labor that kills, but the small attritions of daily routine that wear us down.
Over time, as the daily routines become second nature, discipline morphs into habit.
On the road you can really be more regular about it and work it into daily routines. There's no town that doesn't have a gym. And if you find one that actually doesn't, you can go to the local high school. They always have one.
My daily routine is to make every day the best day.
I don't have a daily routine, beyond brushing my teeth. It changes every day.