Every marathoner knows the “specter” of the final 10K. It is the moment where the internal dialogue shifts from pace-setting to survival. We’ve been conditioned to believe that when our form crumbles and our pace drops, it is a failure of our aerobic engine. We tell ourselves we need more miles, more long runs, more “cardio.”
But according to Arj Thiruchelvam, performance coach at Performance Physique and a specialist in elite movement, we are looking at the wrong set of data.
“When most runners are fading, they’re not fading because they’re unfit,” Arj explains during our recent session. “It’s that they can’t produce the necessary amount of force when they’re tired. Strength training is what holds the runner up when the body wants to lose form.”
In a world obsessed with weekly mileage, Arj is highlighting a paradigm shift in “durability”—and he has a groundbreaking new study to prove it.
The Loughborough Discovery: Beyond the “Fresh” PR
The foundation of our discussion lies in a pivotal study recently conducted at Loughborough University, the pinnacle of British sports science. The research specifically targeted athletes who had already “maxed out” their easy gains. These were sub-39-minute 10K runners with high VO2 max scores.
The participants were divided into two groups: one followed a standard endurance program, while the other integrated heavy strength training and plyometrics twice a week.
“What we haven’t seen enough of until now,” Arj notes, “is how strength training impacts the body after a period of time. We know it helps when you’re fresh, but what happens when you’re 90 minutes into a hard effort? This study adds that key piece of the puzzle.”
The 35% Advantage
The results were staggering, even to seasoned coaches. While the group that “just ran” saw their performance metrics decline as fatigue set in, the strength-trained group showed a 35% increase in time to exhaustion at high intensities.
Perhaps more importantly for the marathoner, their running economy—the efficiency with which the body uses oxygen—actually improved by 2% under fatigue.
“Small margins? Maybe on paper,” Arj says. “But in the final miles of a race, an improvement while your competitors are worsening by 1% is a substantial competitive edge. It’s the difference between a podium finish and a collapse. The investigators must have been overjoyed seeing that 35% figure come through.”
The “Bouncy” Science of Plyometrics
Central to this performance jump is plyometrics, a word that often strikes fear into the hearts of distance runners. Arj defines these simply as movements that encourage “bounciness”—skipping, bounding, and jumping.
He points to the “Drop Jump” as a prime example of the study’s practical application. By stepping off a 40cm (15-inch) box and reacting instantly upon hitting the floor, a runner trains their tendons to act like stiff, efficient springs.
“It’s about force production,” Arj explains. “If you look at older runners, you often see a ‘trot’—a restricted gait with no push-off. We start losing muscle mass around age 32. Strength training and plyometrics aren’t just for speed; they are a literal anti-aging serum for your running gait, forcing the muscle to contract across a full range of motion.”
Becoming the “Coach’s Dream”
For runners wary of the weight room, Arj offers a reassuring roadmap. You do not need to become a bodybuilder. In fact, gaining significant muscle mass is notoriously difficult for distance runners who aren’t in a massive calorie surplus.
Instead, Arj advocates for “Intent Over Volume.”
Frequency
Just two sessions a week for 12 weeks can revolutionize your durability.
The Blueprint
Focus on four key exercises performed with explosive intent.
The Entry Point
Start with skipping. It is a fundamental plyometric used by Team GB Olympians that requires zero equipment and builds immediate “spring.”
The Bottom Line
The marathon is a test of who can slow down the least. By the time you reach the final six miles, your VO2 max is no longer the gatekeeper—your structural integrity is.
“Do this for a single training block,” Arj promises, “and you will see results. You’ll stop breaking down when the race actually begins.”
Arj Thiruchelvam is a performance coach at Performance Physique, specializing in taking runners from novice to elite through physiological science. For more information on his programs, visit performancephysique.co.uk.
