I recently got one of these Fitbit things to track your activity if you know the ones. It records your steps, distance travelled, calories burned and all that other stuff health nuts (not me) are obsessed with.
Also sets goals for you to achieve which is the point of the story. I wore the thing out on an average day hunting and smashed all the goals. More than doubled them.
So yeah, when the wife is bitching that you don't do enough exercise tell her you're going hunting.
Fitbit says it's the best