AceShowbiz - Pregnant actress Jessica Alba insists on keeping fit as she prepares for the birth of her second child because she's convinced a healthy body will produce a healthy baby. The "Fantastic Four" beauty admits she has indulged in all of her cravings since discovering she is to become a mother again, but she's determined to continue exercising to ensure she stays active.

She tells Latina magazine, "Sometimes you can't get a food out of your mind. I could always eat watermelon. With (daughter) Honor, I loved fruit, too. It's a decent craving. You still eat cheeseburgers and pickles - you just want watermelon really bad. I don't deprive myself of anything. I eat whatever."

"I'd like to still do something five days a week, from a half hour to an hour - nothing excessive, just some moving (around). It makes the whole pregnancy so much easier. The more fit you are, the easier the birth is, and a healthier baby you're going to have."

And Alba reveals she's learned to relax and enjoy her pregnancy this time around, having already experienced the emotional rollercoaster when she was expecting Honor. She adds, "Every moment was so new and kind of terrifying and now I know what to expect. It's like, 'It's fine, I've been there before.' With Honor, I was constantly like, 'Is she moving? Is her heart beating?' I'd worry about everything and with this baby, I don't have the same anxieties."