Not with me. You need to have a reason other than looking better naked to stay motivated. Find an exercise or fitness routine that you can get passionate about and then back that up with training for a purpose greater than yourself and some really great things will start happening for you. Me? I use Russian Kettlebells. Training like it's 1911 in stead of 2011 excites me. It also helps relieve stress and connects with me on a spiritual level as exercise became an even more important tool in getting and staying sober.
So to sum it up...
1. Find an exercise or fitness routine that gets you excited. Rock Climbing, Skiing, Swimming, Martial Arts, etc.
2. Support it with a clear cut goal that is focused on something bigger then yourself. For example, my buddy just did a diabetes bike ride to raise money for that charity. Another old friend ran a marathon to raise AIDS awareness and money.
This will help you. I guarantee it.