Flat racing is a form of horse racing which is run on a level racecourse. It is run over a predetermined distance from 2 furlongs (402 m) up to 3 miles (4,828 m) and is either test of speed, stamina or both, whilst the skills of the jockey is determined by his ability to restrain the horse or impel it. Flat racing does not require horses to jump over any obstacles such as is required for hurdling or Steeplechase. It differs from harness racing where horses are pulling a sulky and wear a harness. While in many countries flat racing is the most common form of horse racing, in Britain and Ireland it is used to describe the racing season that comes after the Jumps racing which is traditionally held over the winter period.