Those external nubs strongly suggest something that was used for winding fiber or knitting. Storing thread for sewing? Some kind of frame for a popular knitting pattern?
Love it , wouldnt work where i live , no flat roads. , Would be a new extreme sport going downhill though :) but I think I am gonna go for the one in the comments perhaps hackaday.io/…/180836-desk-ercising-with-the-exer-…
The point would be to be outside. Were traveling right now and I can’t find the link but if you search for wolphrams life hacks type of thing there’s an article he wrote about it which was a fascinating read.
Personally I have an elliptical at home with a laptop stand on it and I love it.
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