Mind over matter and the ambitious nature of the goal that's my drive to be unstoppable and strong enough not give up because that is to easy as anyone else can give up but takes willpower to stick with it .
My goals and my children keep me on track .. Your gf is beautiful btw lucky guy!
I look at pictures of other people with the results I want and I also make working out and eating healthy something to look forward to. For example, I might go on a shopping spree one day for fitness gear and this gets me pumped to use them during my next workout.