Hi, Rosie! How have you been?
I helped dig a couple of post holes when I was 12, and I did it unaided. As hard as it was for me, I think it was equally hard on the bigger kids who were already in their teens.
It was (is) a farming community, so folks work hard for the money.
I did at least some of the holes on my own, but fortunately had a lot of help with pulling fence.
I was very, very sore for awhile. Hard on the shoulders and back, it is! And I’m a computer nerd...I don’t use those muscles very often. ;-)