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From 20 weeks onwards, it is thought best by some doctors to avoid exercises that cause the womb and the baby to bounce up and down on your pelvic floor (such as jogging and jumping) because this might lead to weakening of your pelvic floor. However, other doctors believe that moderate amounts of jogging are not harmful.

Jogging can stress your joints and your breasts, so if you do jog, wear a supportive sport’s bra and running shoes that absorb some of the shock. If you are a serious runner and jog frequently, it is probably best to reduce the number of kilometres you do after 28 weeks of pregnancy, and further reduce it after 36 weeks. This is because there is some concern that strenuous prolonged exercise at this stage of pregnancy could reduce the blood supply to the baby. You can, of course, replace jogging with less strenuous forms of exercise in later pregnancy.