I have a memory of watching a documentary of some sort. I don't know if it was about pregnancy in general, or if it was a "hey look how cool and weird human bodies are", but they had a scene of a woman on a treadmill. They had her walk on the treadmill every day during her pregnancy, and they edited all the walking sequences together to make a moving timelapse video of her belly and boobs getting bigger and bigger while she walked. It stuck with me because her boobs got way bigger than I expected, and they jiggled nicely at the end of the sequence as she walked along.
I couldn't tell you what channel it was on, but I remember thinking it was shockingly well done... like, i think the camera even rotated around her while she walked and morphed from skinny to curvaceous? I randomly remembered it recently, and found myself unable to google it... I just got tons of pornhub slop.
Does anyone else remember this, or any details about it? It wasn't meant to be porn, but man, it was jaw-dropping.