Horseback Riding During Pregnancy: Risks & Safety

Question
I know it is a high impact sport, considered not so safe in pregnancy. The
question is if the riding itself (the movement) is not safe or a high possibility of
an accident should be considered unsafe?

Answer
Both.

The primary concern is the amount of repetitive torso jostling and  spinal impact.

While most adept riders have a relatively low risk of falling or being thrown, in rare instances it can happen.

Less experienced riders will sustain more torso impact/jostling as well as have a much greater risk of an accident.