Don't worry that you have to train for a triathalon with your baby strapped to your back to reap the rewards of exercise. Whether you're walking, dancing, or taking a yoga class for new moms, any movement will tone your muscles, burn calories, and build endurance. Research suggests that new mothers who exercise are often happier and better adjusted to parenthood. And exercise will help increase your energy levels, can help make your sleep patterns more regular, and in general can help you be happier and healthier.