Knowing his limits, and slowing him down?
How do you know how high a horse will jump? I have a 12 year old quarter horse who has free jumped and cleared over 4 feet, but under saddle, he isn't very careful. I don't want to use a solid wood pole, because he's old enough and he's clumsy enough that he could hurt himself, but PVC pipes don't seem to be cutting it.
Also, he is a total speed demon both a few strides before and after the jump, but especially after. I try really hard to control him up to the jump by sitting up tall and keeping a steady contact with the reins, but as soon as I give him the reins a bit so I don't hang on his mouth, he takes off. After the jump, he runs off to the point where I worry about him falling down if I tried to turn him in a circle.
Riders aren't 16 and pregnant. Riders are 16 and arthritic.