I found out recently that one of the local parks has a couple 10 foot walls, so I took my 9 year old daughter over there this morning to see if I could still get over one unassisted after 25 years. Piece of cake. I showed her how to do it, then had her practice on a six foot wall. By the time we left, she was getting over the wall and landing on the other side in under 10 seconds. Finished up by showing her how to do a wall scale using teamwork. After several unsuccessful attempts of trying to grab and hold onto my fingers as I lay across the top of the wall, she finally grabbed onto my wrist, pulled herself up and was very proud of herself sitting on top of the 10 foot wall next to her old man. She got the concept of running up the wall pretty quickly, and when she grows about a foot more, she'll be scaling it without assistance.
I also assisted her with doing pullups, and we did some calisthenics and stretching both before and after.
Best part, a couple kids came over from the children's playground and asked what we were doing. My daughter says "Army training, but without getting yelled at."