It’s funny how I’ve never noticed how much a player’s “approach” factors into the force they generate during a pull. But after watching this footage it’s obvious that footwork plays a huge role in adding distance into a throw.
There seems to be a consistent “big last step” in which all that lateral force is planted into the lead foot and translated into torque. It looks like everyone instinctively does this. To get even more yardage, it looks like many players also “hop” into that big last step, probably storing even more elastic energy in their muscles and tendons during those last microseconds of their wind up.
One thing that’s really interesting to watch is what the “non” frisbee hand is doing. For backhand pullers, most of them seem to be using two hands to wind up, then (obviously) letting go with the non-throwing hand at the moment the forward twist begins. For my forehand throw, I actually seem to use my left arm to generate whiplash and “pre-trace” the path which the disc will take. Super strange!