Thank you to Runna for sponsoring this series and providing my training program. Try Runna for FREE for two weeks: https://tr.ee/icWqec2daq In this video, I run a 19-mile marathon workout in prep for the Berlin and Chicago Marathons. Hope you enjoy! Welcome to the 2:39 marathon prep series! On October 12, 2025 I'll be running my 14th marathon at the Chicago Marathon and aiming to run a new personal best of 2 hours and 39 minutes. In this series, I'm going to give you an inside look at my training block. From my training plan, my diet, speed workouts, strength training, training gear, how to fuel for running, and so much more. New episodes will be uploaded every Sunday at 10am CST. 💸 Discounts and Deals on Running Products: https://linktr.ee/jeremy.miller ⚡️ My electrolytes https://bit.ly/47Kyiyc 🫐 $10 off 2Before https://2before.com?sca_ref=3530967.1YZdFFfnuW 🥩 Get 15% off Frank’s Butcher Shop (JMILLER) https://franksbutchershop.com/ Follow Me Strava: https://www.strava.com/athletes/49516157 Instagram: https://www.instagram.com/jeremymille.r/ Tiktok: https://www.tiktok.com/@jeremymillerfit Website: https://www.jeremymiller.io