Okay once I create a roll action with the foot I need that to be coupled with a shin angle change. Now that shin angle change could happen from the knee end of the tibia where it pitches forward. Some of us it's going to be easier to feel a sense of the bottom of the tibia pitching back.
So whether you go from the knee or whether you go from above the ankle with that tibia we're going to need a forward or backward pitch so that that shin angle becomes a positive shin angle change okay when that shin angle change happens if you work the heel under and towards the ball of the foot we will get a really easy step okay but we want to have this coupling of a roll of the foot with the pitch of the tibia because that gets us into that class two lever area. Whereas if I don't roll the foot and I stay heavy on that whole foot so that the shin pitches I then am at class one and that fulcrum point is at my ankle. The beauty of a class two is it moves heavy load quickly okay. So it's like the wheelbarrow.
So we want to be able to get the roll of the foot and that change of shin angle to lock out the ankle so that we move that fulcrum to the ball of the foot. In things like going downstairs that is going to become much more useful rolling the foot pitching the tibia to move from that transverse arch fulcrum rather than staying in a first-class lever and having that fulcrum point be our ankle. Okay class two moves heavier load faster it's much more efficient.
Think about it would you rather move stuff around your yard using a teeter-totter or would you rather move stuff around your yard using a wheelbarrow? Just something to think about.