Regular exercise (at least 3 times per week) is preferable to intermittent activity and an adequate diet should be followed to ensure you are getting get the right amount of calories for the extra demand on your body. Many of the physiological changes of pregnancy continue 4 - 6 weeks postpartum, therefore, pre-pregnancy exercise routines should be resumed gradually based upon your physical capabilities.

Exercise & pregnancy:
There are a lot of absolute 'don'ts' when you are pregnant and many women find them very restrictive. The Royal College of Midwives in London, agree on the following recommendations:

1. Focus on how you feel during your workout. Since your heart rate is affected by your pregnancy, it's not always the best indicator of how hard you're working when exercising. There are no specific guidelines on how long your workout should be, but it should be based on your pre-pregnancy fitness routine and your doctor's recommendations.
2. After the 1st trimester (3 months) don't do any exercises that call for you to lie on your back - You don't want to compromise blood flow to the baby or run the risk of elevating your blood pressure so you have to adapt your abdominal / back training.
3. Stretching can help to relieve general aches and pains: Never push a stretch beyond the point of mild discomfort and don't hold stretches longer than 20 seconds. You should stretch regularly to help relieve general aches and pains.
4. Weight training is a good idea to continue during pregnancy: Pay attention to your back and shoulders. This can help in avoiding back and shoulder pains and give you the strength to carry your bundle of joy around once he or she is born.
5. Most importantly, practise pelvic floor exercises.
6. The most important thing is to look after yourself and ensure you are as healthy as you can possibly be!