CrucialBMX employee Jamie Donaldson shows you the advantages of running a free-coaster! As you can see in this quick video, he rolls back without having to pedal back, this special hub has become very fashionable recently. There are massive advantages of being able to roll backwards without having to pedal however one downfall is that once the rider is ready to go forwards again there can be a "gap" in the pedal movement. This is called the free-coaster "slack" and it can be adjusted to a certain extent.
When a rider is going backwards this is called "Fakie" in the BMX world..
