A husband who is coaching his wife during labor demonstrates an understanding of the transition phase of labor when, as his wife starts to push with each contraction, he instructs her to do what?

The answer is to take quick, shallow breaths, and then blow. This is done to avoid pushing because full dilation has not yet occurred. Take cleansing breaths before pushing is not advisable now because this is not done 'til full dilation; it can exhaust the mother and also be the cause of cervical edema.