It's so easy to say the things you're going to do. It's even easier to say the things you're thinking about wanting to do at some point in the indiscriminate future. Actually doing those things is noticeably harder. Maybe that's why we have sayings like, "Talk is cheap."
Things really are easier said than done. What we don't realize is that sometimes it's not that much easier. The hardest part of actually doing something is starting. It's about mustering the energy necessary to do something that you actually want to do. It shouldn't be that hard, and once you try doing it, you find that it isn't.
We do have a tendency to wear ourselves out. We have energy, but we expend it elsewhere. We may have the energy to talk about what we want to do, but not to sit in one spot, focus, and actually move our hands enough to record that speech.
Just as a little experiment, try keeping your mouth closed next time and letting your fingers do the talking.