Interesting topic - a friend of mine once told me: "I'm hoping that the stress from paying for a gym membership that I do not use will be enough to make me lose weight" 
On a serious note, gym buddies are a way to go. You won't miss it if you know others are counting on you being there. See if you can get a friend to join with you. I like Inna's idea about classes - some can be really fun. I took a Groove class yesterday - never felt more like a white girl, but I had fun 
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It's all fun and games until someone loses an eye
