Motivation

This morning after work I drove to the gym with every intention of working out.  Once I got there I just sat in my car until I finally just drove home.  I literally couldn't think of much I wanted to do less than go in that gym...except maybe go back to work ; )  Why can't motivation be a continuous, easy concept?  I HATE exercising.  I don't mind some weight lifting I guess, but I would literally rather sit in a hole in the ground staring at one spot for an hour in the mud than go to the gym.  I wish I was one of those people that "love" working out.  Gross.