I joined a gym in February of 2011. I wasn't liking how I looked in the mirror, I felt like crap and was only getting worse. The unexpected benefit of joining a gym with my wife is that I think we are closer now. We spend more time together now and waste less time in front of the TV.

Of course it makes me look and feel good. There is a huge time and lifestyle commitment, but I enjoy it more than I thought I would. Not to mention @Len9798 is looking great too. Benefit for me and her!