In today's episode, Mark again is analyzing motion capture data from elite players—this episode features Rory McIlroy. In this episode, Mark asks Greg and Lou about Rory's left knee movement at address through impact. A little spoiler: his knee does turn quite a bit toward target at impact: but the way that he gets there might not be what you think. And as Mark says, it traces back to a simple setup issue that most amateurs get wrong. There may well be information here that can directly help your golf swing. Where to find us: Mark Crossfield's weekly newsletter: https://www.crossfieldgolf.com/subscribe Mark Crossfield on Twitter: https://twitter.com/4golfonline Mark Crossfield on YouTube: https://www.youtube.com/user/4golfonline Lou Stagner's weekly newsletter: https://newsletter.loustagnergolf.com/subscribe Lou Stagner on Twitter: https://twitter.com/LouStagner Greg Chalmers on Twitter: https://twitter.com/GregChalmersPGA The Hack It Out Golf Podcast on Twitter: https://twitter.com/HackItOutGolf Learn more about your ad choices. Visit megaphone.fm/adchoices