I use what I like to call "environmental discipline". (I think there is a technical term for this in psychology, but I can't find it off hand. Any psychologists know?) Suppose I need to study, but I don't really feel like it. I can will myself to go to a library or coffee shop with just the books I need to study and no distractions. Once I'm there, there is little choice but to work. However, had I stayed home, where there are myriad distractions, I might have gotten little or nothing done. Packing up and walking to another location is easy compared to sitting down tody study, but once I'm at the new location, sitting down and studying is now surprisingly easy.