Forget skeletons in your closet, or bats in your belfrey, you have mummies in your basement.

My version of getting serious about not giving back too much of my riding season fitness gains has been to visit the gym in the evenings, and to install fenders on my hybrid and get cold weather gear so I can ride on decent days over the winter. The GP4Season 32mm tires and SKS Longboard Chromoplastic fenders are working out great on that bike.