I picked up an injury in 2004 which put me out for a year its still not 100% either
I feel bad if i miss a single session,for me running is addictive,i feel i have to train,the fitter i get the more i want ot train and so on. It can be annoying when your thinking about fitting in a session before work,or in your dinner break or maybe in the middle of the night,lol.