Self Negotiation

I'm entering my 8th week of training and, even though spring is right around the corner, I find it tougher and tougher to finish my spinning workouts. Afterall, I can only listen to Coach Troy from Spinervals or stare at the wall for so long. After about 1/2 hour I begin to enter a phase of self-negotiation - "well Matt, you've had a real good half-hour, let's cut this one short" or "we'll really up our time when the weather gets nicer, let's call it a workout". As soon as I get into this phase I try and block it out and forge ahead - most of the time it works. I do use a few tactics to get me through these times of self-negotiation:
1) Think of how good I'll feel when it's done knowing that I worked through the mental and physical challenge2) Block it out - just forge ahead and get it done3) What is your competition doing - they're going to finish the workout, you better too4) Its a means to an end - whatever your goal may be - a race, overall fitness, vanity5) Join a class or get a training partner - hold each other accountableNext time you're thinking about cutting a workout short or not going to the gym today, use these methods and get it done.
What methods do you use to keep going?