I don't body build, I have no desire to, nor do I want that look. I do some lifting for strength training and flexibility, but do a lot of cardio at the gym. I lost over 90 pounds a few years ago and really got my physical well being back in order. My goals are to stay at the level I'm at, and really I use the gym to keep me in shape for ice hockey. A few guys on this board have played with me, they can vouch that I'm no slouch, and when you routinely play against guys 15-20 years younger than you, you need to keep yourself in great shape.
However maintaining a good level becomes increasingly difficult with a full time job, being a parent to small children, and as you get older, it just gets tougher. You have to do a little bit more each year to keep going. But, I enjoy the results on the ice, so I do keep going...