Megan,
You teach him on the ground first.
Since you say he knows it, combine it with a voice cue and bridle cue, on the ground.
Take the horse and put his bridle on, bring a long dressage whip. Go out in the field and apply a little pressure on the bit, as you would if you were on his back and tell him BACK, BACK, BACK and at the same time tap his front feet with the whip (TAP! Not HIT!). The SECOND he backs up, stop tapping and praise him. Progress to where he will back when you tap in FRONT of his foot, then no tapping at all, then no bit pressure. Once he can back with no or only slight bit pressure and just the word BACK, BACK, BACK, then mount up.
Once mounted, lean way back in the seat (over exaggerate at first) and tell him BACK BACK BACK as you apply the same pressure to his mouth as you did in the beginning of the lesson.
THE VERY SECOND THAT HE TAKES EVEN ONE STEP - EVEN IF IT IS ONLY ONE FOOT - BACKWARDS...stop everything and praise him and pet his neck.
Then repeat.
Gradually decrease the pressue, decrease your exaggerated leaning back and soon your horse will back with just the vocal command and slight pressure on the bit.
We also combined our leaning back with tapping our feet on his shoulders, so now my horses back with just a slight tap of our feet on their shoulders.
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