Comment by AnonC

> > Having a trainer has a better set of incentives. Firstly there's the loss-aversion of having already paid for the session. Humans are irrationally motivated by loss-aversion and regualrly succumb to the sunk-cost fallacy.

> I disagree. "Having paid for it" is a bad motivation and sparingly works. I know several folks who bought expensive cameras, bicycles, and guitars which only gather dust.

Yup, I’ve seen the same behavior in myself and others for years. Paying a sum of money, however large it is, doesn’t motivate people to get some value out of it. And gyms thrive on this. What I’ve seen happen is people swearing off gyms after losing money once and probably going back to almost no exercise.