For most distance runners, 42.195 kilometres is measured by physical markers: the glare of streetlamps at sunrise, distance gantries counting down each kilometre, and the shifting asphalt beneath their soles. For BK, a visually impaired (VI) runner preparing for the year-end BYD Singapore International Marathon presented by adidas, the course exists entirely in the senses—the hum of ambient morning traffic, shifts in humidity, and the steady, guiding cadence of his partner’s voice.
Running alongside him is Samuel Lim, affectionately known across the local running community as Uncle Sam. A coach accustomed to the high-octane intensity of fitness collective Fire City, Sam is stepping onto the road not as an instructor dictating a workout, but as an extension of BK’s vision.
Their partnership is not built on sympathy, but on mutual accountability, precision teamwork, and radical vulnerability. As they log training blocks across Singapore’s humidity, their story reveals the anatomy of trust that turns the solitary grind of marathon training into a shared victory.
Photo: SportPlus.sg / Isis Ang
Decoding the Environment: Building a Mental Map
Navigating long-distance courses without sight requires intense sensory awareness. Before their shoes ever strike the pavement, BK and Sam run a mental dress rehearsal.
“Before running, Sam explains the route so I can build a mental map,” BK explains. “While running, I listen to Sam’s voice, footsteps, traffic, and surrounding sounds. I notice turns, smells, and changes in the environment. From Sam’s voice, I can estimate how near or far he is.”
For BK, sensory data replaces sight. Variations in terrain, the heat radiating off concrete, and the tonal shifts in his surroundings assemble into an internal landscape.
“I may not see the route, but I build a picture of it using sound, smell, movement, and Sam’s instructions.”
Translating an unpredictable city into real-time cues requires constant restraint and technical communication from Sam. Having spent years in fitness spaces that urge athletes to blast past limits, guiding demanded a fundamental reset.
“Fire City is a high-energy environment where we encourage people to push their limits,” Sam says. “Guide running requires a different type of coaching. I have to slow down mentally, listen carefully, and move according to BK’s rhythm. BK is still the athlete doing the work. My role is to provide clear information so he can focus on performing at his best.”
Photo: SportPlus.sg / Isis Ang
Overcoming Fear: The Mechanics of Letting Go
Moving fast without knowing what lies five feet ahead triggers an instinctive survival response. For BK, the initial hurdle wasn't building cardiovascular endurance—it was ceding control.
“My biggest fears were falling, slipping, or colliding with something,” BK admits. “Running faster meant giving up some control. I had to trust Sam to see and respond for both of us.”
To deconstruct that fear, the duo stripped training down to its essentials. They ran short, repeated segments, practicing the precise timing of verbal cues before turns, elevation shifts, or surface changes. Each clean landing proved that speed didn't have to mean danger.
“The hardest part was not the running. It was trusting someone enough to move without knowing exactly what was ahead.”
For Sam, accepting that leap of faith carried significant weight.
“BK shared his fears of falling, slipping, or colliding with something. When he trusted me to guide him, I understood that it was both a responsibility and an honour,” Sam shares. “I wanted to support him in every way I could—not by deciding his limits, but by helping him pursue the challenges he chose.”
BK puts it simply: “I gave Sam my trust.”
Sam’s response: “And I knew I had to hold on to it responsibly.”
Photo: SportPlus.sg / Isis Ang
The Anatomy of Rhythm: Synchronisation Under Pressure
Finding a shared stride between two distinct athletes is both art and mechanics. While their initial rapport formed quickly, synchronizing under race-pace demands required hours of deliberate practice.
“The connection felt natural from our first session, but we still practised the technical details,” BK notes. “We used short distances to work on pace, positioning, and instructions. We practised exactly when Sam should announce a turn. Trust came quickly; coordination improved through repetition.”
That repetition transformed verbal cues into intuition. As the training intensified, Sam learned to read micro-cues that reveal fatigue long before an athlete speaks up.
“I notice changes in BK’s stride, breathing, and voice,” Sam observes. “When his stride becomes shorter, his breathing changes, or he becomes quieter, it may mean that he is tired, tense, or processing something. Those cues tell me to check in, but I do not assume I know exactly what he is feeling. BK is the best person to tell me what he needs. I observe, ask, and then we respond together.”
Managing his own exhaustion is equally critical. In the final, punishing miles of a 42.195-kilometre race, an erratic guide voice translates instantly into doubt for a VI athlete.
“When I become tired, I control my breathing and concentrate on keeping my instructions clear,” Sam explains. “BK relies on my voice for information and confidence, so I try not to let my fatigue create unnecessary uncertainty for him.”
Photo: SportPlus.sg / Isis Ang
Fighting Isolation and Breaking Through the Wall
Distance running is often romanticized as an inward journey, but that solitude can feel heavy without visual distractions to pass the time.
“A guide runner makes me feel that I am not facing the distance alone,” BK explains. “Sam connects me to what is happening around us. He describes the route, the surroundings, and upcoming turns. His voice gives me direction and reassurance. We share every difficult kilometre together.”
When the inevitable marathon wall looms, the duo counters mental fatigue by shrinking the world.
“When I feel exhausted, I focus on the next small target,” BK says. “Sam tells me how much distance is left. He adjusts our pace and reminds me to control my breathing. His encouragement helps me stay calm and keep moving.”
“When the distance feels too big, Sam makes it smaller. We focus on the next turn, the next marker, and the next few steps.”
Navigating 30,000 Runners: A Call for Race-Day Inclusion
The Singapore International Marathon course is packed, loud, and intense. Maneuvering through narrow bridge turns, water stations, and thousands of participants presents a unique logistical challenge for a guide-runner pairing.
“We plan to begin in a less crowded position and avoid entering the main racing lines unnecessarily,” Sam outlines. “We use short commands, and I call turns, obstacles, or changes in direction early.”
Yet, race-day safety cannot rest solely on the shoulders of the guide team. True sports inclusion requires collective road awareness from fellow runners.
“Inclusion cannot depend only on the VI runner and guide,” Sam emphasizes. “Other runners can help by not cutting between a VI runner and their guide, allowing them some space, and responding calmly when a guide calls out.”
Photo: SportPlus.sg / Isis Ang
Beyond the Finish Line: Redefining Accessibility
The ambition to run the BYD Singapore International Marathon originated entirely with BK. After tackling a hybrid fitness race together, it was BK who asked, “What’s next?”
“He suggested taking on a marathon because he wanted a bigger challenge and hoped to inspire other people with visual impairments,” says Sam. “That is important to me because this is BK’s ambition, not something I chose for him. My role is to support the goal he has chosen and help him reach the same starting line as any other athlete.”
For Sam, training beside BK has reshaped how he views the built environment.
“BK has taught me to listen before leading and that trust carries responsibility. He has also made me realise how many things I have taken for granted because I can see,” reflects Sam. “For me, going somewhere unfamiliar, finding a restroom, or trying a new activity feels simple. For a person with a visual impairment, poor access or a lack of assistance can turn these everyday situations into major barriers.”
“The lesson is not that VIs are incapable. Often, the environment has simply not been designed to include them. When we improve access and offer the right support, we allow people to show potential that was already there.”
When the pair finally rounds the bend toward the finish arch at the Padang, the clock will record their timing, but the numbers will pale in comparison to the shared journey behind them.
“I want to prove to myself that I can complete the marathon,” BK says quietly. “Crossing the line will celebrate the trust Sam and I share. It will show what a blind runner can achieve with the right support, and I hope it encourages others to take their own first step.”
“I cannot see the finish line, but I know what I want to feel when we cross it—proud, free, and grateful that we made it together. We may cross the finish line as two runners, but we will reach it through one shared rhythm and one shared trust.”