More than 150 thousand people are expected at Badminton Park Estate in Gloucestershire this weekend for the annual horse trials.
The three day event is one of the most prestigious in the world. The trials were cancelled last year due to poor weather.
This year the competition is tougher than ever with Olympic Gold, Silver and Bronze medallists taking part.
The Queen's granddaughter is in with an outside chance of a medal in the individual eventing and currently lies second in the Team event
Read the full storyEmma Walden meets Zara Phillips, who is training hard for the Olympics. She missed the last two games because her horse was injured but both her mother the Princess Royal and her father Capt Mark Phillips have competed in the past.
Zara Phillips has been selected for the British equestrian Olympic team.
She'll be following in the footsteps of her mother Princess Anne and her father Mark Phillips,who were both involved in previous Olympic games.
Nearly a quarter of a million people are expected to attend the four-day festival, which finishes on Friday with the Gold Cup.
