We were at a playground, and he was playing on some low to the ground monkey bars. He holding on the bars and was swinging back and forth. He said to me “Dad, do this”.
I got down on the ground, grabbed the monkey bars and tried to swing. The problem was that I was to big, so I had to hold my legs out in front of me while I was swinging.
I am not used to this, and in the process pulled my ab muscles. I was sore for several days afterward.