Falling with Grace
Riding is an inherently dangerous sport, thus if you spend enough hours in the saddle you know it is inevitable that you will hit the ground at some point. The important thing is to fall without getting hurt, or at least minimize the chances of injury by learning to tuck and roll. Never put your hand out to break the fall or you will end up breaking your arm. More importantly, spend hours learning the basics of balance, riding in rhythm with relaxation. With the correct education you will learn to identify dangerous situations and alter the course of action prior to disaster.
Here is an extraordinary video of a horse who back flips to dislodge his rider, in this case I would recommend not attempting to ride this horse until he learns to keep all 4 feet on the ground.