I have a stationary bike in my living room. It serves several purposes. Sometimes it is a coat rack. At other times, it is a fun way to burn off a little energy, though admittedly these times are rare. Usually, the stationary bike is there for the purpose of improving me. I ride it to make me healthier and fitter. Ideally, this means that in the long run, I will likely be happier as a result of using it, but the immediate effect of working out on the bike isn’t my happiness. Happiness is a byproduct of the work I put in. The stationary bike exists for me to do work and to be a better pers...