If we can get this licensed from Image or AMC or whoever it is that owns the bloody rights, we'll be filthy rich... :-)
Exercise 1, the Undead Shuffle: Put on a heavy weighted belt and try to walk. Additional weights on wrists and ankles optional.
Exercise 2, the Neegan Back Lean: The dynamic full-body arch the head saviour likes to do while giving one of his famous speeches. The advanced form includes a dumbbell overhead press or kettlebell swing.
Exercise 3, the Walker Brain Stab: An over-the-shoulder one arm standing cable press.
Exercise 4, the Stuck Walker: Push your chest or full torso against an obstacle such as a wall or a rack while simulating walking motions. Future enhancement: a special sled that can be pushed with the chest.
Exercise 5, the Don't Bite Me: A one- or two-arm standing cable chest press, emulating the movement one performs while trying to keep an attacking walker out of biting range.
Who's got more ideas? :-)