The ability to stay focused positively relates to the quality of athlete's performance

IELTS SUMMARY MONTH: PERIPHERAL VISION IN SPORTS

Athlete's focus is the one of the most important effect on their perfomance.It can achieve something of what they want maximumly by focus. The athlete must be kneely aware of what happens all around them .

Athlete's performance depends on training visual abilities.Not jus they rely on their muscles or incredible abilities belong to them. The athlete also focuses or detectes all kinds of motion from the angle and never lose concentration and numerous kinds of distraction for athletes . For example ,for volleyball player must be attention to body positioning in relation to the speed and angle of the moving ball as well as to the court boundaries

In summary, the athlete focus is very vital because it can impact all of athlete working ways and always keeping on track many times to be professional athlete

Hello

Your text will sound better if you rewrite some of the sentences as suggested below:

Athlete's focus [...] ability to stay focused positively relates to the quality of his or her performance.
It can achieve [...] this sentence is redundant... you should consider removing it.
TheAthletes must be...
Athlete's performance [...] is also dependent on how quickly he or she orients within the competing ground.
Not jus they [...] Winning in sports is not only about the strength of one's muscles, but also about the quickness of the concerned person's mind.

The athlete [...] Athletes must be capable of concentrating on the achievement of a particular goal, without paying attention to any distractions.

As for the rest of the sentences, I suggest you make them shorter. Also, try to make sure that one sentence logically derives from the previous one. I hope this came of help. Regards.