Going through every aspect of an event in your head before an event is a time management strategy mental rehearsal dress rehearsal performance

Going through every aspect of an event in your head before an event is a Mental Rehearsal

Explanation:

Whether it is athletics, power lifting or soccer at the athlete level the best of the best use mental rehearsal. It prepares the mind for what’s coming in the event and the performance becomes much more natural and unconscious. The unconscious mind runs the body and therefore physical activities are done unconsciously. By doing mental rehearsal, you are communication with the unconscious mind in the way it likes it best (through pictures, sounds, feelings, tastes and smell). By rehearsing, you are making the situation more familiar, which as a result makes you more comfortable  

answer: because barriers look like ball

explanation: there round and blue like my ball

just have more confidence in yourself.