A friend of mine said the other day that that knitting burns calories. From what I've found online, it looks like you burn anywhere from 80 to a little over a 100 calories an hour knitting depending on your current weight. Sweet!
If you burn that many calories just knitting, how many do you burn when treadling a spinning wheel? I had a harder time finding an answer to that question online. I would assume that it burns more considering there is more body activity compared to sitting and knitting.
Whether you are knitting or spinning, know that you have not only the pleasure and relaxation from those activities, but you also have the added bonus of burning some calories. :)