For many runners, completing a marathon is a monumental achievement, regardless of their finishing time. This past weekend, over 59,000 individuals participated in the London Marathon, a diverse group that included celebrities and seasoned club runners. However, it was a small cohort of elite athletes who captivated the world, particularly when two of them crossed the finish line in under two hours, a feat that left many in disbelief.

Kenya's Sabastian Sawe, 31, stunned spectators by becoming the first person ever to legally run a marathon in under two hours, stopping the clock at an incredible 1:59:30. His compatriot, Yomif Kejelcha, followed closely at 1:59:41. This landmark achievement surpassed the previous closest official time of 2:00:35, set by Kelvin Kiptum in 2023. Even the legendary Eliud Kipchoge's sub-two-hour run in 2019 was achieved in a controlled exhibition rather than a competitive race, making Sawe's record truly groundbreaking. Sawe's performance was remarkable not only for his pace but also for his extraordinary endurance, maintaining a stable stride and resisting the usual signs of fatigue that affect other elite marathoners in the final miles. He averaged around 4:33 per mile over the 26.2 miles, consistently holding speeds above 13mph from start to finish.

Sports scientists attribute Sawe's unparalleled performance to a rare combination of physiological factors. Dr. Richard Blagrove, an expert in endurance physiology at Loughborough University, highlights three core elements: maximal oxygen uptake (VO₂ max), the ability to sustain that oxygen use, and running efficiency. Based on laboratory research with top athletes, Blagrove suggests Sawe excels at all three, likely possessing a VO₂ max in the high 70s to low 80s, the capacity to sustain over 90 percent of that for approximately two hours, and exceptional running economy.

Beyond these, a fourth crucial factor identified is "durability." While most athletes experience a decline in efficiency after about an hour of intense running, Sawe exhibits a much smaller deterioration. As Blagrove explains, "The athlete at the start line is almost the same athlete you see at the finish," suggesting a unique physiological resilience that sets him apart.

Central to understanding Sawe's capabilities is VO₂ max, a key indicator of fitness and long-term health. The term "VO₂ max" measures the maximum volume of oxygen your body can take in and utilize during intense exercise, typically recorded in millilitres of oxygen per kilogram of body weight per minute (ml/kg/min). A higher VO₂ max signifies more efficient heart, lung, and muscle function, leading to better physical fitness, a reduced risk of cardiovascular disease, and potentially increased longevity. During exercise, lungs absorb oxygen, red blood cells transport it to muscles, and muscle cells convert it into adenosine triphosphate (ATP), the body's primary energy source. Therefore, more oxygen translates to greater energy and enhanced performance, explaining the increased breathing rate during physical exertion. A high VO₂ max indicates efficient oxygen delivery and utilization, making it a strong marker of cardiovascular fitness and a valuable tool for tracking endurance training progress.

Behind Sawe's exceptional physiological profile lies one of the most demanding training regimes in elite sport. According to Runner's World, he typically runs between 125 and 150 miles per week during marathon preparation. This high volume primarily consists of easy mileage, complemented by two high-intensity sessions and a weekly long run of approximately 40km, often executed at a pace closer to race effort than traditional endurance training. This strategic blend of volume and intensity is designed to elevate his physiological ceiling while simultaneously conditioning his body to recover faster under repeated stress. An insider noted, "He looks unusually relaxed even during hard efforts. Even near-race pace sessions can look controlled."

Dr. Ross Tucker, a sports scientist, points out that while high mileage has always been a component of elite marathon training, the current ability of athletes to tolerate such mileage in conjunction with higher intensity work might be evolving. Tucker suggests that advancements in footwear, specifically carbon-plated shoes with improved cushioning, could be a contributing factor, allowing athletes to absorb greater training loads with reduced injury or fatigue costs.

Furthermore, like many Kenyan runners, Sawe benefits from training at altitude in the Rift Valley. Lower oxygen levels at higher altitudes stimulate the body to produce more red blood cells, enhancing oxygen delivery when racing at sea level. Over time, this adaptation can significantly improve endurance capacity and efficiency under stress. Tucker adds that "altitude ancestry" – a long-term background of living at altitude over generations – may also contribute to an athlete's ability to tolerate extreme endurance demands. In essence, experts agree that Sawe embodies a rare synergy of optimal physiology, remarkable training tolerance, and exceptional efficiency, demonstrating a body that not only performs at an extreme level but sustains it longer than most, prompting questions about the ultimate limits of marathon running.

While the focus often shifts to the elite, completing a marathon is a massive accomplishment for all participants, and the recovery process demands just as much discipline as the race itself. After crossing the finish line, many runners are eager for indulgences like carbohydrates and alcoholic drinks. However, Francesca Bagshaw, a performance physiologist at Manchester Institute of Health and Performance (MIHP), emphasizes the critical importance of proper hydration, nutrition, rest, and blood flow for effective post-marathon recovery.

Immediately after the race, Bagshaw recommends consuming 20 to 25g of protein alongside a carbohydrate-rich snack. Subsequent meals should be balanced, incorporating protein, carbohydrates, and vegetables. Hydration is equally vital; runners lose essential electrolytes and water through sweat. Bagshaw advises weighing oneself before and after the race, aiming to replace 150 percent of bodyweight losses. For example, a runner losing 1.5kg (from 70kg to 68.5kg) would need to replenish 2.25 litres of fluids.

Adequate sleep is another cornerstone of recovery, crucial for muscle repair and replenishing glycogen stores, the body's primary fuel source during the run. Bagshaw suggests eight to ten hours of sleep to support these processes and bolster the immune system, which can be weakened after long-distance running. To facilitate better sleep, she recommends preparing a cool, dark bedroom, avoiding stimulants like caffeine for at least six hours before bed, abstaining from alcohol due to its dehydrating effects, and putting away melatonin-disrupting blue-light devices such as tablets and phones. A small protein-rich snack before bed can also aid muscle recovery during sleep.

For addressing the inevitable cramps, aches, and pains, various methods can accelerate physical recuperation. While a hot soak might be tempting, Bagshaw suggests contrast bathing – alternating between hot and cold water immersion, often available in health clubs. The cold water induces vasoconstriction, restricting blood flow to muscles, while hot water promotes vasodilation, increasing it. This alternating action creates a "pumping" effect that flushes fatigue-inducing metabolites and promotes fresh oxygenated blood flow. Dr. Leon Creaney, a consultant in sport and exercise medicine at MIHP, cautions that contrast bathing can be unpleasant for novices. An alternative is intensive heat therapy through saunas. Jake Newport, CEO of Finnmark Sauna, highlights that saunas increase blood circulation, easing muscle tightness, promoting deep tissue repair, and improving sleep. Regular sauna use is also linked to lower stress levels due to endorphin release and significantly better heart health, making it an increasingly popular component of runners' recovery routines.

The return to physical activity should be gradual. Bagshaw advises complete rest for the first three days post-marathon. Towards the end of the first week, low-impact activities like walking or swimming can be reintroduced. Exercise levels should then be gradually built back up over two to four weeks. Dr. Creaney concurs, adding that a full week of rest is acceptable, and starting with gentle walks, stretching, and massaging can effectively reduce muscle soreness. He suggests attempting a one-mile trot the day after this initial rest, then progressively resuming a regular running program over the subsequent month.