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Disclaimer : All models on this website are 18 years or older. All galleries and links are provided by 3rd parties. We have no control over the content of these pages. We take no responsibility for the content on any website which we link to, please use your own discretion while surfing the links. 2014, Dennis Kimetto, the marathon world record-holder, cruised along at 12.

8 mph — about a 4:42-per-mile pace — for 26. Scientists are uncovering what makes the Bolts and Kimettos of the world tick, and how we evolved to do both. That knowledge is redefining what’s possible and may help you speed up, too. Muscle fibers come in two general types, fast- and slow-twitch, and everyone has a mix of both. Slow-twitch fibers have more mitochondria — the cells’ powerhouses that use oxygen to make energy — so they don’t fatigue as easily and are ideal for longer activities. As you’d suspect, sprinters have more fast-twitch fibers, while endurance athletes have more slow-twitch.

Although partly genetic, there’s some evidence we can train in order to change the proportion of fibers our muscles have. For example, distance running at a slow pace may increase a person’s percentage of slow-twitch fibers. Everyone takes the same amount of time between steps and the same amount of time to pick up their leg and put it back down again, but faster sprinters propel themselves farther in that time. Peter Weyand, a physiologist and biomechanist at Southern Methodist University in Texas. Fast people hit with more force in relation to body weight. They get that extra force from their characteristic knee lift: Raising the knee higher gives the leg more space to gain velocity before hitting the ground, so it hits with more force. To sprint faster, Weyand suggests two things.

First, try to get the foot that’s behind you off the ground faster. Second, try to keep your body stiff when you land. To run fast for a long stretch, energy supply is key. If you run faster than your body can supply energy, you’ll have to slow down. The faster you can run at a lower rate of energy burn, the better off you are. There are two ways to improve energy supply while maintaining a quick clip: either produce more energy or burn less. Producing more means increasing something called VO2max, the maximum amount of oxygen you can take in and turn to energy while exercising.

Having a high VO2max is partly genetic, but also somewhat trainable, especially for new runners. To boost it, run interval workouts: After a warm-up, run hard for 3 to 5 minutes, then jog for 2 to 3 minutes to recover. To burn less energy, you’ll need to improve efficiency, or running economy. Ways to do this are less fleshed out than methods of increasing your VO2max, but Weyand says the typical approach of tapering before a big event — reducing mileage and running faster workouts — can help. But Alex Hutchinson, author of Endure: Mind, Body, and the Curiously Elastic Limits of Human Performance, says the best thing is simply to run more. A prehistoric cave painting in Libya depicts a hunter chasing prey.

According to a theory made famous by Dennis Bramble and Daniel Lieberman in a 2004 Nature paper, humans are born to run — and run far. Lieberman, a human evolutionary biologist at Harvard University. The theory proposes that early humans evolved these adaptations, along with tracking, to chase antelope until the animals collapsed from exhaustion and heat stroke. Keeping Cool: In addition to being furless, we have far more sweat glands than most other mammals, giving us an advantage over fuzzier animals that have to stop and pant to cool down. Baby Got Back: A large gluteus maximus muscle — a big butt — is a distinctive human feature. We rely on it minimally for walking, but it’s crucial to stabilizing us when we run.

Springy Tendons: Our legs have long tendons — such as the Achilles — that act like springs, helping generate force and reducing the energy cost of running. And they don’t seem to provide much benefit to walking, another piece of evidence that our bodies are made for running. Olympian Eliud Kipchoge sports Nike’s Zoom Vaporfly Elite shoe, designed to help him and other elite runners break the two-hour marathon barrier. In December 2016, with the world marathon record at 2:02:57, Nike announced an audacious goal: to break the two-hour barrier.

Experts initially balked at the mission. But last May, Eliud Kipchoge, a 2016 Olympic gold medalist marathoner from Kenya, ran 2:00:25 — just one second per mile off the necessary pace. The sport’s governing body doesn’t consider Kipchoge’s run a world record because it didn’t follow the regulations for official records. But physiologists are using it to devise ways to cross the threshold on a record-eligible course. Hutchinson guesses there are a few factors that helped Kipchoge. Nike’s new shoe technology, engineered for the project, probably shaved off a minute.

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