In addition to increasing your energy levels, exercise helps you maintain a positive outlook and feel confident about your changing body image. Exercise can also ease common pregnancy discomforts such as nausea, leg cramps, swollen feet, varicose veins, constipation, insomnia, and back pain. By keeping muscles strong and toned, exercise makes it easier for your body to deal with changes in posture during pregnancy. There is also evidence that increased fitness helps shorten labour and your post-partum recovery time and lessens your overall anxiety about the birth.