Free by definition means without restraint.
Would you not agree that my inability to instantaneously teleport to Japan would classified as a restraint? We are restrained to the laws of physics. I cannot hover two inches above my chair simply because I WILL it, it's physically impossible.
Let me try and water this down for you as a lower intellectual. My thumb is free to do all thumb-like things, it can move this and that way, back and forth, all because I will it too. Its movements can be completely spontaneous. However, I cannot WILL my thumb to float off my hand, glide across the room, suspended in air by only MY WILL and toggle a light switch, only to be gracefully returned to my hand upon completing that task. I could however, sever my thumb from my hand via sharpened machete, pick up the amputated figure and throw it at the light switch, hoping that it make contact and toggle the lights. It's possible, just not enjoyable.
On a genetic level, a peach tree cannot grow apples just because it WILLS too. It's genetically impossible.