Okay, I'll be the first to be the first to admit that I'm probably as fit as a... Um... I'll leave it to you to think of a comparison apt enough to define me.
Sloth?
Nah, a sloth is naturally hardwired to remain stationary for most of its day/life/existence. I choose to act this way.
Bart Simpson?
Well, for the sake of this blog post, let's assume that Bart is in the middle of an existential crisis and needs to focus on achieving self-actualization instead of moving his lazy ass off the couch... Which, if you think about it, happens to be the root of said existential crisis.
I might not be sure of my identity and purpose in life, but I don't think it's the cause of my current state of unfit.