There is all kind of ATV racing.  As you can see here in this picture they are in an arena.  This kind of racing is called arenacross.  This type of racing consists of turns, table tops, doubles, triples, and step ups.
In this picture this guy is racing out doors on a track.  This is called motocross.  This type of racing is probably the most popular kind.  It is just like arenacross but is much bumpier and a lot of the time the jumps are bigger.  This takes a little more endurance and skill.
Before I tell you anything, don't try this at home.  Now this isn't racing but is still a competition.  This is called freestyle moto x.  This sport has the biggest jumps out of any other kind of racing.  Normally the jumps are at least 100 feet long and a lot time use ramps instead of dirt jumps.  They are judged by judges or by the audience to see who pulled off the best trick.  The winner either gets money or a vehicle most of the time.
Another ATV sport is the hillclimb nationals.  This is probaly the most dangerous sport you can do.  The hills they climb are so big that you would think that nobody could ever go up the hill.  It consists of starting at the bottom of the hill then you go up a semi steep part and then levels off.  When it levels off you fly into the air and then hit the steepest part of the hill.  This is where most people flip their quads over at.  You have to jump it to get the fastest time or you will never win.
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