Nerves can make or break a race day, but managing them is easier than you...

https://kylersbestjournals.capitaljays.com/posts/regulation-167-of-the-human-medicines-regulations-2012-explained-simply

Nerves can make or break a race day, but managing them is easier than you think. One simple tip is to breathe deeply—inhale for 4 counts, then exhale slowly for 6 to 8