Trying to hide it from the wife gives the wife a +15 skill bonus to finding out. It might be better than write it off as exercise cost. Tell her it'll help you get rid of the roll around your waist line. If you don't have a roll around your waist, murder Cherry Garcia or Rocky Mountains until she starts complaining about your waist line.
"The Bird of Hermes is My Name, Eating My Wings to Make Me Tame."