We're not a family of early walkers. Zach's Mom walked at twelve months: fairly normal but definitely not early. His dad, aunt and his sister all waited until they were in their 14th month. That's not zippy.
However, Zach has begun at 9 1/2 months. The crazy thing is that it appeared that he could have started even earlier. He was certainly strong enough and didn't have any problems standing for long intervals. He didn't quite trust his balance enough to let go though. It all changed on the weekend, and the boy is quite chuffed over himself.
I marvel at the uniqueness of it all. Given family dynamics, where does this earliness come from? He certainly doesn't seem to be terribly aggressive or rambunctious, and, being almost quiet and studious, his personality doesn't seem to be as out there as his sister. If it were simply a matter of physical strength I concur that he certainly has that, but I imagine that there's more to it. What that something is, I'm not sure. Is it blind chance that he simply happens to discover his legs early, or is there something in the construction of his brain that leads him to do this? I don't know the answer, but I do find it fascinating to observe and speculate.
Below: a few video clips spliced together and my attempt to add a music track.