Well if it makes you feel any better at all, I still feel lazy. But playing sports is way easier and more fun than going to the gym. Maybe that is the way to do it. Either start swimming again, or find some kind of sport like soccer or something. Just to get active again. Then going to the gym wont seem so crappy cause you wont be as lazy
But seriously go to the gym...I've gotten into the habit, and its doing great things for me.