How high are the fences during the show jumping phase of Olympic eventing?

Equestrian is the ultimate in team sports, a horse and rider working together for years to hone feats of grace, daring, agility and speed.

Chariot races and horse riding appeared in Greece's ancient Games, but most of the equestrian programme as we know it began in the Olympic Games of 1912. It includes three disciplines - dressage, jumping and the three-day event - each with individual and team competition.

Olympic jumps can be as high as 6 feet, and as wide as 6 feet.