Contractions

NoName
So I was watching a video that a lady posted on YouTube of her labour contractions to show women what it was like.
With contractions women always say your uterus starts to tighten.
In the video the lady posted you can actually see her belly tightening.
I showed it to my fiancé so we know what kind of thing to expect when the time comes but we were wondering if you can see your belly tightening with every lady or whether it's different for everyone?