There's no finish line. That's a big pill for people to swallow, Every single day for the rest of your life, you are going to have to make better food choices, and move around a bit more.
Even though you really don't feel like you're motivated to go to the gym, remember how good you felt after the last time you went. Keep that in the forefront of your brain.
CrossFit is all about constantly-varied, high-intensity movements. And to do these movements, you have to have a certified coach to take you through this - or any type of physical activity.
The CrossFit program is broad, general and inclusive, and most of all, the movements can be scaled down to any level of athlete. Just watch what I do with it on 'The Biggest Loser.'