just do it

Just because I was reminded of it.
Just because it makes me feel good.

When you run, fear can't catch you
When you jump, doubt falls behind
When you play, the voice you hear is your own
And the more you listen, the more you feel free

No, I didn't write that. I have no idea who did. I think it was from a Nike ad, but I can't be too sure. I'm not even sure about the wording.