I think this question brings up a larger question, do you really have any free will at all? one could argue that your choice has already been made at the beginning of time, based on the direction and speed of particles colliding and that we all are derived from processes, like dominoes falling from before us. When the first Adam's split in beginning of time, their cascading interactions led to this moment and the choice of you going left or right.

But to look at another way. I help teach people some tumbling. The process of learning which is your dominant leg to leap off of for a cartwheel lets say... goes something like this. Close your eyes, then have someone give you a small push from behind. whatever leg you step with first, is your dominant leg. This being said, my dominant leg is my right so I probably take a right step first and go down the right path. :/ ... That is my thoughts.. Lol.