Low-impact activities at a moderate level of effort are comfortable and enjoyable for many pregnant women. Walking, swimming, dancing, cycling, and low-impact aerobics are some examples. These sports also are easy to take up, even if you are new to physical fitness. 
Some higher intensity sports are safe for some pregnant women who were already doing them before becoming pregnant. If you jog, play racquet sports, or lift weights, you may continue with your doctor's okay. 
Keep these points in mind when choosing a fitness plan: 
•    Avoid activities in which you can get hit in the abdomen like kickboxing, soccer, basketball, or ice hockey. 
•    Steer clear of activities in which you can fall like horseback riding, downhill skiing, and gymnastics. 
•    Do not scuba dive during pregnancy. Scuba diving can create gas bubbles in your baby's blood that can cause many health problems.