Meredith Dietz Meredith Dietz Senior Staff Writer Experience Meredith is a marathon runner and stand-up comedian. As Lifehacker’s Senior Staff Writer, she covers personal fitness tech, home gym equipment, and more. Read Full Bio May 8, 2026 Add as a preferred source on Google Add as a preferred source on Google We may earn a commission from links on this page. Credit: Meredith Dietz Table of Contents Last weekend, I strapped two Garmin running watches to my wrists and raced a 10K—the top-of-the-line Forerunner 970 on one arm, and the budget-friendly Forerunner 165 Music on the other. Whether you're toeing the line at your first 5K or chasing a marathon PR, one thing I learned is that even the most powerful running watch in the world won't help you on race day if you haven't set it up properly beforehand. Here's the checklist I wish I'd had before race day. How to train with a Garmin watch before a race Once you've registered for a race, it's time to start training.…