Susi Lehmann is a German ultra-trail runner and adventurer. She partners with Magdalena on major multi-day mountain running projects, such as attempting the Fastest Known Time (FKT) on the Via Alpina, covering thousands of kilometers and tens of thousands of elevation meters. Her work is rooted in endurance, nature, and storytelling, sharing their journeys through outdoor media and documentaries. Together with Kalus she also helps raise awareness for environmental causes through their endurance projects.