Racing nerves can throw off your focus when it matters most, but simple...

https://www.bookmarkmaster.win/nerves-on-race-day-are-normal-but-learning-to-manage-them-can-boost-your-focus

Racing nerves can throw off your focus when it matters most, but simple breathing helps calm the mind. Try a 4-count breath in, then 6 to 8 counts out to steady yourself before a lap