Working out is great for your body and brain. A study in Mental Health and Physical Activity (2011; 4 , 65-69 suggests that people who exercise at least 150 minutes a week reported 65% better sleep quality. They also said they fell asleep faster and had less daytime tiredness.
In addition to helping people fall asleep faster, there is solid evidence that exercise helps people fall asleep more quickly.
And getting a good night’s sleep affects athletes in profound ways. The amount of sleep an athlete gets impacts their reaction time, attention and focus, physical recovery and injury proneness.
For more information on how exercise improves sleep see this John Hopkins article.