Elite training: Kiplimo’s data edge

A marathon block is really a balancing act between stress and repair: one hard session breaks the body down, and the next night of sleep and easy running rebuild it. Jacob Kiplimo says he now checks that rebuild process on a Galaxy Watch8 instead of guessing from feel alone as he prepares for the 2026 London Marathon. (samsungmobilepress.com) The watch is not timing only his runs. Samsung’s profile says Kiplimo uses Samsung Health data on sleep, recovery, heart rate, pace, and running-form metrics like asymmetry to decide whether to push, hold, or back off on a given day. (samsungmobilepress.com) Asymmetry is a simple idea with a fancy name: it is the gap between what your left side and right side are doing. For a runner, that can work like a car pulling slightly to one side, where a tiny imbalance repeated for thousands of steps can waste energy or hint at fatigue. (samsungmobilepress.com) That kind of data matters more when the athlete is already near the limit. World Athletics says Kiplimo ran 57:20 in Lisbon on March 8, 2026, taking 10 seconds off Yomif Kejelcha’s official half marathon world record, so the gains he is chasing now are measured in seconds, not minutes. (worldathletics.org) London is also the sort of race where one bad recovery day can show up 35 kilometers later. World Athletics says Kiplimo is in the men’s field for the TCS London Marathon on April 26, 2026, alongside defending champion Sabastian Sawe, Olympic champion Tamirat Tola, Joshua Cheptegei, and Yomif Kejelcha. (worldathletics.org) Kiplimo is not new to the marathon, so this is not a beginner using a gadget for motivation. London Marathon Events says he was runner-up in London in 2025 and arrived in the 2026 field as the reigning Chicago Marathon champion and half marathon world record holder. (londonmarathonevents.co.uk) The shift here is that wearables have moved from counting steps to steering training. In Samsung’s account, Kiplimo treats the watch as a daily decision tool, using overnight and workout data to fine-tune volume and recovery the way coaches once relied mostly on notebooks, stopwatches, and morning conversations. (samsungmobilepress.com) That does not mean the watch is replacing coaching. It means the watch is adding a constant stream of measurements between sessions, so a coach and athlete can spot when a hard week is building fitness and when the same hard week is just building fatigue. (samsungmobilepress.com) For elite distance running, that is the new edge: not one magic workout, but hundreds of tiny corrections. If Kiplimo reaches London on April 26 with the right legs instead of just the right ambition, the useful part of the technology will have happened long before the starting gun. (worldathletics.org)