Hey Donna,
Congrats on the feature and I'm sorry I didn't see this sooner.
I'm incapable of sitting still for more than a 1/2 hour at a stretch. I remember my parents saying, when I was a lad, they thought I had worms or something, because I'd wriggle around so much. I read somewhere recently this is actually a good thing as these types of people don't have any problems being overweight or obese.
Also, I learnt a series of exercises many years ago while in the defence services. Isometrics is a system developed by the Swiss to keep their military fit during the long winter months. It involves clenching and relaxing the different muscle groups in the body (yes, including the 'butt muscles'). I've been doing it for so long now, it is almost a reflex. And it works.
Good article, Donna. Keep 'em coming.