I walk about 3 miles a day, I practice tai chi, and I'm soon going to re-start bellydancing. I'm the only member of my family who hasn't had back surgery, and I'm really interested in keeping that title...so strengthening my abs and taking pressure off my lower back sounds like a Really Good Idea.

And bellydancing is a heck of a lot more fun than crunches. (Over the years, I've learned: if something isn't fun, on some level, I'll give it up eventually.)