That's why it's called a discipline. Our ability to make an effort, to work, grows stronger with active living and grows weaker with passive living. The more we do, the more we can do. The less we do, the more difficult everything becomes, including writing. That's one reason why reading is such an important part of writing.
Reading requires effort.
It strengthens us. That's also one reason why spending too much time in front of a TV can be so harmful. It weakens us. When we spend hour after hour passively watching TV, we are watching someone else's creative power, but aren't doing much for our own. If anyone had a legitimate excuse for not developing writing power, it was a little girl from Tuscumbia, Alabama, named Helen Keller.