My midwives got very serious for a moment one day, a few visits ago. I went to sit up from a back-lying position in a normal, non-pregnant fashion. (like a sit-up, sort of) and they said, "Whoa, whoa, whoa....no. Roll onto your side first. You should never sit up from lying on your back. Because the abdominal muscles move to the side to account for your expanding belly, you put a lot of strain on them and move the uterus awkwardly when you do that. Always roll to your side first."
Last night, in my first yoga class (DAMN, that was harder than I expected!!!) the instructor had us all roll to our sides to get up from an on-your-back position, too.
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