My oldest son has muscular dystrophy. He used to play in a wheelchair soccer league. When he had spinal surgery to insert a rod in his back, he had to give it up.
The wheelchair soccer got pretty competitive. For anyone not familiar with wheelchair soccer, players use a sturdy plastic box that's mounted to the front of a chair. The box is used to strike the ball. The ball is oversized (about the size of a beach ball). Two orange cones serve as a net.
One time, at a tournament in Rochester, I observed a player who used a special mouthpiece to maneuver their chair. The person didn't have the use of their arms. To me, that showed incredible determination. We all need to apply that same type of determination to achieving our writing goals.
How often do we tell ourselves we're too tired to write, or say something idiotic like "I'm just not feeling it today." Sometimes, when I need a mental kick in the ass, I think back to that wheelchair soccer player. Don't let lame excuses keep you from pursuing what you love to do. Go write.