| you shouldn't be in the saddle when jumping.... |
That's not true. If that's the case, then many of those GP Jumpers are doing it wrong. Silly them.
To the OP - you don't put your seat in the saddle by leaning back, you put your seat in the saddle by sitting down.
Leaning back, means that the rider is getting behind the motion and going behind the verticle, which creates the rider to get left behind.
I'm not quite sure what it is that you are asking though...........