... And water is wet.
On the other hand, one can not mention this enough!
To me, aches in my back are the indicator to stop spending all my time behind a desk, and do some (light) exercise.
About an hour of swift walking or cycling is all it takes to resolve the pain. If I manage to do this on a regular basis - i.e. daily or every other day - I never experience back issues, but it also improves my general well-being.
Mens sana in corpore sano!