Walking is great exercise. You may have overtrained some muscles in your first session. You may have tried to go at your pre-pregnancy pace. In the second half of pregnancy, the additional 50 percent blood volume and 32 percent increase in respiration will allow you to reach your target heart rate zone with less effort. Listen to your body and use perceived exertion to monitor your intensity.

The recommended level is to feel you are working "somewhat hard." I would not give up on walking. Just tune into the body -- not just the walkman.

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