What most naturally follows?

How to stop a horse rearing
Figure out the reasons for rearing.
A horse will rear for numerous reasons, but for the most part this can be linked to fear. A horse will rarely show its underbelly, the main situation they would do this in the wild is when stallions fight for a mate.
In general kicking out and bucking is more common, and when young horses are backed, this is the natural reaction. If a horse is rearing there may be a serious reason, maybe it was taught to by previous mishandling or poor riding, for example.