Working out should be fun right?

I like to sing and sing loud when I'm really working out. I know the theory is that if you can sing or hold a conversation while working out that you aren't working hard enough but I disagree at least for me anyways. Today in the middle of my cardio Billie Jean came on and I was belting it out. My son was asleep in his room downstairs heard mommy being so loud that he had to come see what I was doing which of course made me laugh. My abs hurt from singing and laughing so hard I couldn't even bring myself to do the ab work after my cardio today. I'd say that today I had fun. Are you enjoying your workouts?