怀孕前就开始做运动。 怀孕期间只做安全的运动。 计划每天做30分钟运动。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Exercising before and during pregnancy can help protect you from developing gestational diabetes.    Research has shown that women who were physically active for 4 hours a week or 30 minutes a day, before and during pregnancy can reduce their risk of GDM by about 70%.  Always ask your doctor about how much and what type of physical activity are right for you. Safe exercises to participate in during pregnancy typically include low impact exercises, such as walking and swimming. Avoid doing any ty