Mark O'Meara taught Tiger Woods to fly fish. It is reported that Tiger's learned to double haul the first day.
The lesson here is that pro athletes have what I call super proprioception. This is the ability of the mind to unconsciously know the position and relationship of the body to itself in time and space. For example, when we close our eyes, we can touch our fingers to our nose. Without proprioception we would not know the spatial relationship of our fingers to our nose in space and time.
This ability allows pro athletes to "learn" other skill based sports faster than non athletes. John Elway played both football and baseball at Stanford. He was drafted by the New York Yankees in the second round in 1981 and got 150K for playing summer baseball between his Junior and Senior Year. He could not be on the Stanford baseball team his senior year but he could still quarterback the football team.