Play!! Horseback riding should be FUN, not just work! If you think it's all business, what does your horse think??
Do a boot race. Each take off 1 boot & leave it at one end of the arena. Ride to the far end. On "go", run (ride) horses down to boots, jump off, grab your boot, put it on, get back on & race back.
Set up a trail/obstacle course. Set up barrels, cones, poles in a pattern & walk, trot, lope, back through them.
Practice unlatching, opening, walking through, closing & latching a gate while mounted.
If your horses are safe enough, do marco polo, chasing each other with eyes shut.
Place a barrel at the far end of the arena. Set something on top of a barrel (a cone or something). Race down, retrieve it, race back.
Set up the barrel pattern (cloverleaf). Get a pair of pantyhose, a jacket or whatever & each of you hold an end of it & ride the barrel pattern together, each on your own horse.
Practice bareback riding.
Magazine race/game: hold a magazine under your arm (like with your arm pressed against your body while riding bareback. Walk, trot, lope, back. Hold the magazine as long as you can WITHOUT touching it with a hand. The last one still holding the magazine wins.
Learn how to properly show at halter.
Can you go on a trail ride or ride in an area where you normally don't?
Broom Race-- run down to other end of arena, dismount, someone holds your horse, place forehead on broom, turn 3 circles as fast as you can, then attempt to lead your horse back to the finish line.
Practice using only voice commands to get "walk", "trot", "back", "stop".
Drop your reins & only control speed. Let your horse choose direction.
Braid your horse's mane & tail.
Do you know all parts of a horse? Write different parts on paper, attach a piece of tape to the back & label your horse!
Work on desensitizing: plastic bag on the end of a stick, tarps on the ground,
Have your horse walk over a "bridge" (a very sturdy pallet with slats very close together)--do this unmounted & mounted, flapping raincoats, etc. Get one of those huge exercise balls & bounce it around the horse. See if you can dribble it while mounted.
Please learn to enjoy yourself!! Horses should be a release, not all work & business. Learning can be fun! And remember to give your horse lots of praise & release when she does something right! She earns it.