If, like Garyck and Craig, you have friends who are already Rec Center members you might consider inviting them to drive with you so that you both have to show up, even when you're tired. Or plan a workout together and then grab coffee together after!
If you're looking for a buddy you can start by attending a group fitness class, joining the adult swim team, or come to the Rec Center on Wednesday mornings during coffee Wednesday to meet other members.
If you are fortunate enough to have a gym or swim buddy, be sure to let them know how important they are to you. You might just make their day :)