When I was evangelical, my prayer life was short and sweet. It consisted mainly of the various thoughts or requests inside my head. In a sense, I was talking to myself more than to God. When I returned to the Church of my youth, I had to learn a different way of praying.
Why is exercise so hard and downright painful? Because my body naturally would rather be sitting back in an easy chair getting fat.
Well, the same goes with the brain and spirit. It is actually quite Biblical. Pre-composed prayers help train our minds to consentrate. My brain, like my body, would rather be sitting in a mental easy chair getting fat. The pre-composed repitition of the rosary breaks through that. It helps in training my brain so, when I do pray with my own words, I now have a context to do it with.
But here is something even more amazing. The more I exercise physically, the healthier I am, exercise isn’t dragging, I become energized. The same with the rosary. The more I pray, the more energized I become, mentally and spiritually.