Pivarnik says this largely depends on the level of activity done while pregnant, and the intensity of labor.

Pivarnik说，这在很大程度上取决于在怀孕时活动的程度和产程的强度。

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The same is true with strength training, Pivarnik says, which has also been shown to have little to no ill health effects for pregnant women.

Pivarnik说同样在力量训练中，这种训练应该是被证明对孕妇是有很少或几乎没有影响健康的。

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James Pivarnik, Ph. D., FACSM, says that hundreds of studies have shown physical activity to be not only safe, but beneficial, for expectant mothers.

美国运动医学会会员James Pivarnik博士说，有数以百计的研究表明，孕妇体力活动不仅安全，而且有利。

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Pain and undue fatigue are often signs that a person is doing too much too soon, says Dr. Pivarnik.

WSJ: Restaurateur Scales Up to an Intense Routine

Jim Pivarnik, a professor of kinesiology at Michigan State, says setting a comeback schedule helps ease back into a workout routine safely.

WSJ: Restaurateur Scales Up to an Intense Routine