Its getting cold and some days ago, I wanted to get warm fast. So instead of turning on the heater, I did some push ups. After I did 12, I felt quite ok with the room temperature. This lead me to an experiment for this winter:

No heater. Only excercises!

So I have been doing a lot of push ups, dumbbell curls, pull ups and all kind of shit for a week now. The temperature is a constant reminder and it kicks my butt to get up from the computer and train a bit. There is a good bit of motivation, because I get instant gratification: Feeling warm again!