Take every emotion you have ever had, put it in a blender and fire it up. This is what it might feel like for an Olympic athlete standing on the edge of a diving board or in the blocks on the track or facing a balance beam or pommel horse waiting for the signal to start. Got pressure? Every sweaty, chalky, bloody day, every goal set, every sacrifice offered up, every thought and every breath has been about getting to now. Blow it, and the dream is over. There is no second chance today, and the next tomorrow is four years away. So how can it happen that even Olympic athletes choke under pressure?