Titan works on a flat collar. The treat is trapped under the thumb and first finger against the palm and the hand is held on the outside of the muzzle. The handler puts pressure on the leash, drawing it straight across in front of his body, which creates an opposition effect. The dog moves the opposite direction of the pressure and into the hand, and just as soon as the rear end moves, the pressure is released, the behavior is marked and rewarded. It is very important that you release the leash pressure immediately as the dog complies when he is learning.
Over-exaggeration is good. We bring the dog behind our knee once he knows how to move off the pressure. From here, you can continue and teach the dog to back around you and back to heel position. But this is what the first steps look like. Titan doesn't even realize he is being taught a new behavior! He thinks this is simply another opportunity to earn treats!