Surprising how one gets used to ideas and terms then apparently can’t remember how to explain or define said term.
I thought a working trot was defined as a trot in which the horse tracked up, and in which the poll is the highest point of the neck.
Some horses will be limited by their conformation so in those cases liveliness, engagement perhaps, but engagement will also depend on fitness and training level.
Please help me remember how to think about what a working trot is.