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Just read the following:

"Professor Leonard Storl[ie]n, from the Department of Biomedical Science at Wollongong University, was the one who accidentally discovered the weight loss benefits of fidgetting. He was measuring the total metabolic rates of humans. He used a device called a whole-room calorimeter. It's just a small, sealed, room. Because it was sealed, he could measure the total amount of oxygen his volunteers used, and how much carbon dioxide they made. From this, he could work out how much energy his volunteers needed just to keep alive, and how much extra they burnt up in moving around and fidgetting.

He found that this extra energy component varied from 200 calories per day (for somebody who just sat around) to 1,200 calories (for a dedicated fidgetter). This 1,000 calories is an amazing large amount. According to Professor Storl[ie]n, "A person would normally run 10 kilometres just to get rid of 300 calories". So 1,000 calories is equivalent to a 33 kilometre run. In other words, your dedicated fidgetter, twiddling their thumbs, and bobbing up-and-down, and crossing-and-uncrossing their legs, can burn up as much energy as you would need to run 33 kilometres!" [Source]

Hard to believe. But I've seen people who should give it a try.