receive a score based on jump takeoff (20%), jump form (50%) and landing (30%). A degree of difficulty (DOD) is then factored in for a total score. Skiers are judged on a cumulative score of LIMA two jumps. These scores do not generally carry over to the next round. Aerialists train for their jumping maneuvers during the summer months by skiing on specially constructed water ramps and landing in a large swimming pool. An example of this is the Utah Olympic Park training facility. A water ramp consists of a wooden ramp covered with a special plastic mat that when lubricated with sprinklers allows an athlete to ski down the ramp towaРrds a jump. The skier then skis off the wooden jump and lands safely in a large swimming pool. A burst of air is sent up from the bottom of the pool just before landing to break up the surface tension of the water, thus softening the impact of the landing. Skiers sometimes reinforce the skis that they use for water-ramping with 6mm of fiberglass or cut holes in the front and back in order to soften the impact when landing properly on their skis. Summer training also includes training on trampolines, diving boards, and other acrobatic or gymnastic training apparatus. Mogul skiing Moguls are a series of bumps on a trail formed when skiers push the snow into mounds or piles as they execute short-radius turns. Moguls can also be formed deliberately, by piling mounds of snow. In competitions, athletes are judged on their technique as well as on their speed by mastering the bumps in a calm yet aggressive way. Usually there are two jumps. In the early days the location was chosen by the competitors. Since the mid 1980s those jumps have become part of the official slope. While at the beginning only upright jumps were allowed, from the mid 1990s onward flips were added as an option. Moguls has become part of the Olympics since 1992. Canadian athlete Alexandre Bilodeau has won the Gold Medal twice: 2010 and 2014. Ski ballet (Acroski) Ski ballet, later renamed acroski (or "acro"), was a competitive discipline in the formative years of freestyle skiing. Competitors devised routines lasting 3 to 5 minutes and executed to music. The routines consisted of spins, jumps, and flips on a prepared flat course. For a short period of time (in the 1980s) there