We males are deeply aware of spatial relationships and are utterly infatuated with trajectory consciousness. (i.e. Baseball, basketball, football, soccer, golf, cricket, etc. etc.) Look at how much we pay those males that are good at it from David Beckham to Tiger Woods.
Here is a link to a series of photos of Eamon Sullivan doing what every boy who has ever had access to a pool has done every summer.
From the Sydney Morning Herald: [Link]