Do you expect beautiful, transformative, profound words to flow from your fingers the moment you sit down to write? If you do, I bet you're often disappointed.  Why not borrow a technique from the jocks — warm up first. Here's a warm up technique I learned from Natalie Goldberg, in my opinion the best writing teacher on the planet.

Write (longhand works best for me, but you can use a keyboard if you want) for 5 minutes, beginning every sentence with the same noun-verb phrase. Some examples are:  "I am" … "I am not" … "I have/don't have" … "I love/hate" … "I go/went" … and on and on. Think up your own — any verb will do. Use different forms — he/she/they/you, as well as I. Use different tenses — future, past, present. Use positive and negative forms of the verbs. (Warning: the negative forms will often take you to your dark side — but this is well worth exploring.)

Here's a warm up I wrote some time ago, using the phrase "I am":

I am in way over my head drowning in salt water and choking on long strands of green seaweed that is clogging my eyelashes as well as my throat.  I am in a hurry, but have nowhwere to go. I am intending to dance someday soon, maybe when my legs grow longer. I am in a canoe riding the rapids of imagination but I lost my paddle so I am careening down a waterfall, and I see no earthly reason why I have to wear a helmet, what's the point, it'll just act as an anchor and drag me down into the water. I am aware that I've made a complete circle back to drowning, I wonder what that means. Perhaps it means nothing except more slag for the compost pile.