I SHOULD do like Walkamile describes. And I do some of that. For example , if while coming up from the pasture, teh horse is dragging behind on the lead, and stops to think about the friends he left behind, I will do a little tuneup on "lead up prompltly" " don't go past me", " back up lightly" "no grazing on the leadline" "stop and wait for me going through the gate" and turn to face me when I ask, " and move your shoulder over, please" "NOW!"
Usually that takes very little time, and we are walking along anyway. While tacking up, I will often get Z's attention and ask him to just cock his head and give me his eye, just for heck of it.
He's good about mounting mostly, but when I am ready and ask him to move off, if there is any kind of sucking back, I pop him one, right at the get go. He should remember that my leg says go! So the whip giving my boot a loud snap is enough to wake him up.
I work on getting him to be responsive off the leg, like one warning, then he'd better move noticeably faster when I put the leg on again. And in writing this, I realize that I actually have allowed him to get rather dull lately because of my own dullness . But, that's for me to smarten up about , so I can help him.