Take Eliud Kipchoge. The two-time Olympic gold medalist (including at Tokyo) and first human to record a sub-2-hour time over 26.2 miles, Kipchoge prepared for the Games with Libre Sense, the world's first glucose sport biosensor.1 Libre Sense is a small round biosensor (approximately the size of two quarters) worn on the back of the upper arm. For up to 14 days, the biosensor provides real-time glucose values through a mobile app1 and wrist readers2 developed by Supersapiens, a sports technology company focused on improving athletic performance. And just as other Olympic hopefuls like Great Britain's Jenny Nesbitt have their sites on making future Games and are using Libre Sense in their prep — 'Just seeing what fuel or food works better for me. So it's just changing a few things I've taken on board since I started using Libre Sense. Learning what my body does in response to fuels and gels and drinks on long runs will be invaluable. I can really see its value there going forward,' Nesbitt said. — so too are elite marathoners bracing for the gantlet of this year's majors.