My new writing tool is a jump rope.
All winter I’ve struggled with the fact that if I sit still for an hour or two I get cold, and I happen to have a profession which requires sitting still a lot. My space heater helps, as does getting up to do the dishes, but generally I would get uncomfortable and my writing would suffer.
Then I read a writing blog somewhere about the importance of keeping blood flowing to the brain. This made perfect sense, and combined nicely with the solution to another problem of mine: a lack of cardio exercise in the winter.
Hence the jump rope. I now pause my writing whenever I need to think and jump rope for a minute or two. This gives me time to puzzle out a new solution to my writing problem, warms me up nicely, gets the blood recirculating quickly, and over the course of a morning spent writing, adds up to a decent amount of cardio exercise.
With my jump rope I will now be better able to complete my novel and will (finally) be able to compete with the girls on the playground.