Forward Progress

[Theisey]

One foot two foot, red foot blue foot...
It really doesn't matter as long as you and your partner are consistent. We don't want to confuse the Umpire now.
By that I mean, come in until you start encountering players, then stop. Plant that one foot or both feet and always use the same foot for the forward progress point. That should be the foot in the direction of the opponents goal line.
The center of that foot is the forward spot of the ball.

I know guys that as soon as they have the spot marked, they pivot about that spot so they are facing the oponents goal line. Whatever works for you. I have no problem with that.