Commonly, we "treat" ourselves after we accomplish something. Often we say, if I run 5 miles, I'll get to eat that cookie. Instead of making the reward a treat, make it something you want to/need to do, like shower.
For me, it first started off as laziness. I didn't want to shower twice in a day, (do you know how long it takes long hair to dry?), so I'd make sure I'd schedule my workouts before I needed to shower. And if I showered before I worked out, I knew I wasn't going to "work out" later on that day, no matter how much I told myself I would. So in order to make myself workout, I wouldn't be able to shower until I did. Subconsciously, I've made my "treat" the right to shower.
if you're having trouble keeping up with your workouts, try to make you treat the right to shower. You'll be much more inclined to get it done, or face you family and friends being really stinky. :-D
Lots of people practice this in their own way. What's your treat?
happy showering :)