Last year’s breakout star in the marathon signs with Puma. Last year’s breakout star in the marathon signs with Puma. We catch up with the two runners to learn about how they trained for the Hoka Project Carbon X 2 100K record attempt. 10 treadmill models that will keep you running strong all year. If you want to swap out your morning cup of joe for tea, here’s where to start. This tool allows you to figure out how fast you're going when using a run/walk plan. These options can give that good gut bacteria a boost—here’s why that matters. The new record-holder has a lot left in the bank at 37 years old. The Latest from the Runner's World Collection | Follow Us | | | | Privacy Notice | | Runnersworld.com ©2021 Hearst Communications Inc. All Rights Reserved. Hearst Email Privacy, 300 W 57th St., Fl. 19 (sta 1-1), New York, NY 10019 | |  | | | | | |