Rein usage- Direct vs Indirect rein
What you'll need:
Chair, desk/table, string ( or something similar such as baling twine, clip-on reins, etc.), strainer/pot with two handles, something slightly heavy- box of rocks, etc.
Attach the "reins" to the handles of the pot or strainer.
Place the box or weighted object in the middle between the pot and where you are sitting- with it resting against the pot.
Sit in the chair with your forearms resting on the table, hold the reins as you would when you ride with your thumbs up.
The pot is your horse's head. The weighted box is his neck.