Well he made a bet to see if either the player can jump 6 to 7 feet or they can't, so he believed in himself and did it. Which made him successful today. <span />
His willingness to demonstrate that he could, believing that he could.
Explanation:
He tried high jump for the first time when challenged by members of the track and field team. He, then, sought to prove them wrong and believed that he could. He trusted himself.
