Forget the gym!!!
Team in Training will whip you into shape, and you will have a lot more fun doing it!
Start at any level, pick an event to train for over the next 4 - 7 months, and join the team. The coaches will outline everything for you. All you have to do is follow the schedule and raise funds. The funds mostly go to cancer research (some goes to pay for your event and travel, the program, and help cancer patients defray costs).
You can choose to run or walk a marathon or half marathon, undertake a triathalon, or bike a century ride. You can be very experienced or not even a teeny bit experienced (beginner swimming/biking lessons can be arranged).
I went from zero to marathon in about four months and I still can't believe I just ran a full marathon. And along the way, I had a great time, met fantastic people, and raised money for a great cause.
I loved the tream approach, the idea of exercising outdoors, mostly whenever and wherever I wanted, and the fantastic coaching.