Feeling jittery before a race? Staying calm comes down to simple breathing and...

https://mike-wiki.win/index.php/Is_Calm_Really_Faster_in_Racing%3F_Exploring_the_Science_Behind_Optimal_Performance

Feeling jittery before a race? Staying calm comes down to simple breathing and shifting how you think. Try breathing in for four counts, then out slowly for six to eight