You forgot to add "and don't eat it back." I think that latter is the usual issue rather than insufficient exercise. I recently had the same experience as you. Then I got sick. Then I ate it back. Then I felt fine again and have more muscle and bone and fat, all of it. Whatever. At least I climb faster. This forum has had posts by many, many people who empty the refrigerator after a long hard ride and then gain weight.
__________________
Results matter