In the not-so-distant past, women were urged to cut down on or even avoid exercise during pregnancy. But researchers believe fitness activities are a big plus for not only the mom-to-be, but also for the baby in the womb.

According to a study by the researchers in the United States, a fitness programme is the best way for the duo to stay in shape and obtain a feeling of wellness.

"There are so many rumours out there, some started or perpetuated by popular pregnancy books, others the result of old wives' tales or outdated advice, that many women really are confused about what they can and can't do," Laura Riley of the American College of Obstetricians and Gynaecologists said.

"You need to be physically active during pregnancy. It has terrific benefits that are associated with a better pregnancy outcome and even shorter labours. It's a win-win for baby and for mom," she said.

However, the researchers have advised that pregnant women should consult doctors before starting any exercise programme. The reason for that is some moms-to-be might have specific conditions or medical complications.

Moreover, according to the research, there's no target heart rate during the pregnancy period. "People are still stuck on this heart rate issue, and it was never based on anything concrete," said Riley, stating that the "target heart rate" concept has been abandoned a long time ago.