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This is just for the gentlemen here, like chuckfan1:
I will defer that in order to perform a legal pop move, the left foot leaves the ground and a delivery is not made. But it leaves the ground at the same time as the right foot. So, if the left foot leaves the ground first, or without the right, and there is not a delivery to the plate, it's a balk.
When Lou Brock stole a base, against most pitchers, including all those with a wide stance, he used the backs of the pitchers' knee joints as his trigger move. If he's stealing, as soon as the back of the left knee begins to bend, he bolts. This actually occurs an instant before the foot begins to lift. The same goes for the right knee being the first to move on a step-off move, alerting him to go back.
So if you think about it, even if the front leg begins to wiggle and a delivery is not made to the plate, it's a balk.
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