Carrie Underwood recently displayed the best kind of fitness -- fitness of the body as well as the spirit. She took part in the 8th Annual City of Hope Celebrity Softball Challenge, showing off her batting skills while raising money for City of Hope, "an innovative biomedical, research, treatment, and education institute dedicated to prevention and cure of cancer and other life-threatening illness." Judging by the pictures, it looks like Carrie might really have some skills!

Janet Jackson is once again relying on a hardcore workout regiment to get into superstar shape before her comeback tour (scheduled to begin September 7). Six days out of the week, she spends an hour working out in the morning, loosens up for a bit, then dances ... for eight hours!

I remember reading about her fitness routine the last time she got her body into completely amazing shape -- it was really tough, but incorporated all kinds of fun things that she loved to do, like dancing and playing basketball. What a smart way to approach fitness!

If you follow E! News or keep your eye on any red carpet events, you're probably familiar with the rail-thin physique of Giuliana Rancic. She recently told Shape magazine that it doesn't come easy -- she works hard to have that body. She even said, "I hate it when celebrities say they never exercise but are really in the gym five days a week. So I'll be honest: I run an hour a day, weight-train four times a week, and watch what I eat."

That didn't surprise me too much, but I really liked what she had to say about getting her upper body red carpet ready. She doesn't starve herself or do anything crazy -- she weight-trains. Hard. For two weeks before the event, she really works her arms, shoulders, and chest, and then makes sure to wear a strapless or halter gown to show off her hard work.