Dave here. Came across a study of 550 moms and their preschoolers which says there's a direct link between the activity of the mom and the child. And with that, a bunch of suggestions as to how to stay healthy and active so your kids will tend to do likewise.
Go for a hike with your baby in a front carrier or sling, or if she can sit up already, a backpack. Just be sure your baby is well supported and make sure you don't strain your shoulders, neck or back.
Have your partner or caregiver watch the baby for a half hour so that you can get out for a walk around the neighborhood and enjoy some precious time to yourself.
Should you be balancing work and baby time, bring your Nikes to work and take that stroll at your lunch break. Lottsa company out there!
Check out a nearby health club or yoga studio. Just be sure that if they offer a babysitting service that your baby is in a safe, secure childcare area with a specialized staff, not part-time locker room attendants who double as babysitters.
Consider investing in some home exercise equipment that you can use while baby is napping. Even something as simple as a jump rope or some dumbbells will help get you into shape.
Think about joining a mom-and-baby stroller program like Stroller Strides, Baby Boot Camp or Stroller Fit. It's a great way to get outside, exercise, meet other moms and spend time with your baby.