Mastro's mental prep before halfpipe runTo play this video you need to enable JavaScript in your browser.This video can not be playedMastro's mental prep before halfpipe runClose00Watch as the USA's Maddie Mastro prepares for the half pipe by visualising it in her head.Watch more Winter Olympics videosSubsectionWinter OlympicsPublished12 FebruaryShareclose panelShare pageCopy linkAbout sharingRead description