sentence: A group of people waterski in a body of water using a boat as propulsion in the water. sentence:   A man gets on a water ski with both feet and begins to waterski while holding on to a rope attached to a boat. sentence:   The camera shows a reverse play of a  person doing a backflip out of the water an onto water platform attached to a boat. sentence:  The people continue to water ski in narrow calm water surrounded by foliage.