premise: A male Equestrian rider leans forward as his horse stretches out for the 2nd jump of the course, as the crowd looks on with amazement. hypothesis: A young girl rides her horse for the first time.
contradiction: A male Equestrian ride and a young girl cannot be the same person, they are of opposite genders. Also a young girl riding her horse for the first time would not be competing in a horse race. This means she would not lean forward as her horse stretches out for the 2nd jump of the course as this happens during a horse competition.