While morning sickness, weight gain and fatigue may make you feel like skipping your exercise session, a light to moderate exercise program can strengthen your body, de-stress your mind, and help you feel better. . As pregnancy progresses, the heart is less able to adapt to the increased demands of high-intensity exercise, along with the release of relaxant hormones, the joints loosen up; There is an increased risk of injury during exercise. Here's a look at the dos and don'ts to make exercise safe during this period. Remember that exercise goals during pregnancy should be discussed with a physician.