Writing Momentum

My Merriam-Webster dictionary defines momentum as a property that a moving body has due to its mass and motion. I imagine my college physics book has a very similar definition. Anyway, I've been lacking motivation to write lately. I definitely have mass, tipping the scales at about 168 lbs. I also have been in motion plenty since I run and walk a lot too. But I lack writing momentum. How is that possible? Well it's quite simple. I need to simply write.  And then I need to find those things that are an impediment to my writing and find a way around them. I really enjoy writing and I believe I just have to keep at it. Doesn't this sound like a pep talk. Perhaps I needed one.