Saturday, I caught and passed a buggy pulled by a single horse.
Today, I almost, but not quite, passed a buggy pulled by two horses.
Therefore, after some calculations, I have concluded I put out 1.65 horsepower.
I am a professional mechanical engineer, so you can trust my calculations. Honest.
No need for fancy power meters on my bikes, as long as I have Mennonite horse and wagons I can use as a gauge.