(Another) Sign of Aging

So Mickey and Minnie are here visiting and we went to the park. All was well until I got on the swings! They wanted me to impress them with how high Aunt Red can go. So, of course, I take them up on their challenge and in the process made myself somewhat sick. I was sort of dizzy and car sick at the same time. It was awful. Is this normal? Does your body not like swinging after a certain age?

I am now realizing that I better get on the kid wagon sooner rather than later.....