Personally, I don't buy it -- that the run-around that comes with parenting can serve as enough exercise or an effective diet plan. But actress Melissa Joan Hart calls being the mommy of two little boys a constant workout. Running around and caring for sons Mason, 3, and Braydon, 8 months, is how she stays fit, says the one-time Sabrina, the Teenage Witch star.

"You don't have time to eat because you're chasing them all the time!" says Melissa. Yea, not for me. I have two little boys -- ages 7 and 5 -- and for all these years, I have found time to eat, sometimes even too much. What I haven't always found time for is my own personal exercise time. Maybe lifting babies in and out of high chairs all day does the trick for this celebrity. For me, not so much. Keeping my body in shape takes a whole lot more. It takes running, walking, biking, swimming, and lifting. It takes lot of time, lots of commitment, and lots of sweat.

I wish it were as easy for me as it is for Melissa. But it's not. How about you -- does parenting keep you slim?