Birth
They say yoga is the correct way to go through birth. Birth isn't easy, but people keep telling you that yoga is the right way to prepare and actually do it.
Picture multiple people you know saying you should do yoga if you plan to give birth. It isn't a question of whether you want to, it's the correct way to do it. So you should.
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To prepare for giving birth you end up doing so much yoga outside that you get a really deep tan (たん).
Hopefully having a tan doesn't make birth harder, since you've worked so hard to do this the correct way with so much yoga.