Feeling jittery before a race? Staying calm and focused can make a big...

https://gracesnicejournal.publishlane.com/posts/why-does-deep-breathing-advice-feel-useless

Feeling jittery before a race? Staying calm and focused can make a big difference on track. One simple trick is to breathe in for a count of four, then out slowly for six to eight—this helps settle nerves