Tons of people die in their sleep!

So, just to be safe, don't ever sleep...

Walking to work does not prevent a sedentary lifestyle. A little exercise doesn't make you fit.

I mean, it's pretty common for people to have a heart attack from sudden exertion, too. Like snow shoveling.

And I remember Douglas Adams died after a workout and he was probably reasonably fit at the time (in theory anyway).

So don't exercise.