Pick a workout you can live with and put it on your calendar like an appointment...no like a job. This eliminates that question in the morning..."should I workout today, or not"...if it's in your schedule, you go. If something UNAVOIDABLE comes up, than you make up the work. It has become an obligation!
My torture of choice is spinning. Although, for me it isn't torture...it has become more like an addiction. And I don't like exercise. Spinning is fast-paced, exhilarating and the calories that I burn per class alone is enough to keep me coming back for more.
I spin on Tuesday, Thursday and Saturday mornings each week (then I try to throw something in at home on an off day to get 4 days in). On these days, I know what I have to do, and I do it. And even though some days it's a little harder than others to get myself to the gym (especially the freezing cold days), I go and feel great afterward. I pull on my cycling shoes, strap on my heart monitor and suit up for work. Hard work.
So I must go now, and psyche myself up for the cycle and put on my garb. Spandex...nothin' but spandex! I'm kidding.