In the language of parkour, balancing on narrow walls and railings is called "équilibre".
stems from the Latin verb "excellere" – "excel, distinguish oneself". Only those with the ambition to continually improve will excel in the long run. To be brilliant requires aspiration to high standards, on the one hand, and circumspection, on the other. If you know what is happening to the left and right of you, and still keep your sights fixed firmly ahead, you will be able to balance even at lofty heights.