There are few basic exercises which will help increase your strength and flexibility. If you have limited time, this exercise are highly recommended and should take only about ten minutes per day. Check with a qualified prenatal exercise instructor if you are not sure that you are doing the exercises correctly. This exercise is also known as “flying arm exercise”. Recommendation: repeat 5 times.
How to do the exercise:
1) Raise your arms over your head. Keep your elbows straight and the palms of your hands facing one another. Hold for at least 20 seconds.
2) Lower your arms out to your side. Keep your upper back straight.
3) Bring the backs of your hands together as far as possible behind your back and stretch.
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credit: basic exercises for pregnant women – http://www.babies.sutterhealth.org/during/preg_basicexercises.html