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Hiking the Thames Challenge: 100 Kilometers in a Heatwave. September 2023

  • Writer: John Haslett
    John Haslett
  • Dec 1, 2025
  • 5 min read

Updated: Dec 4, 2025

One of the most demanding physical and mental challenges is hiking long distances under extreme weather conditions. Recently, a 100-kilometer continuous hike along the River Thames tested endurance, preparation, and resilience. Starting from Putney Bridge and ending at Henley, this journey unfolded under a scorching heatwave with temperatures soaring to 33°C. The experience revealed the importance of pacing, hydration, teamwork, and mental strength.



Early Morning Start and Initial Progress


The hike began promptly at 7 a.m. from Putney Bridge. The early morning air was fresh, and the sky was clear blue, offering perfect conditions before the heatwave intensified. The route passed through Barnes, a charming riverside neighborhood, where the calm river and green surroundings provided a peaceful start.


By 10:20 a.m., after covering roughly 15 kilometers, the first pit stop offered a chance to rest briefly, enjoy a snack, and refill water supplies. This break was crucial to prepare for the rising temperatures expected later in the day.


Midday Heat and Key Landmarks


Continuing the journey, the next major milestone was Kingston upon Thames, reached by noon. At this point, the 25-kilometer mark was crossed around 12:30 p.m. The sun was now high and intense, making the walk more challenging. The path led through Richmond and Hampton Court Palace by 1 p.m., where the historic architecture contrasted with the natural beauty of the riverbanks.


The heatwave was in full effect, with temperatures climbing to 33°C. Walking under such conditions required careful attention to hydration and sun protection. Frequent water breaks and light, breathable clothing helped manage the heat.


Afternoon Stretch and Second Pit Stop


The route continued through Walton-on-Thames and Staines-upon-Thames, towns that offered brief moments of shade and respite. The second pit stop came as a welcome relief, allowing hikers to rest, eat, and rehydrate.


By 4:30 p.m., 40 kilometers had been covered. The halfway point was approaching, but the heat and fatigue were becoming more noticeable. Maintaining a steady pace and managing energy reserves became essential to avoid exhaustion.


Reaching Halfway and Health Challenges


At 6:40 p.m., the halfway mark was reached at Runnymede. This stop was more than just a rest; it was a moment to assess physical condition. Feeling unwell, the i consulted the medical team and learned that too many hydration tablets had caused discomfort. The advice was clear: rest and drink plenty of water.


After an hour of rest and a small meal, energy levels improved. This experience highlighted the importance of balancing hydration supplements with natural fluids, especially in hot weather.


Night Hiking and Teamwork


The second half of the challenge required walking through the night for safety reasons. Hikers paired up, and the i teamed with Monic. Equipped with headtorches, we entered woodland areas marked by glow sticks, navigating uneven terrain with exposed tree roots.


Careful teamwork helped avoid injuries and kept morale high. Emerging from the forest, Windsor appeared around 10:20 p.m., with Windsor Castle illuminated in the distance—a motivating sight after hours of walking.


Overnight Fatigue and Final Rest Stop


The night hours were the toughest. Exhaustion set in, and aching feet and legs made every step difficult. The next rest stop came around 2 a.m., where we gathered in a hall. Some lay on the floor, others sat quietly, all sharing the common goal of finishing the challenge.


This communal rest provided physical relief and emotional support, reminding everyone that endurance is as much about mental strength as physical ability.



By 9:45 am, I had covered 99 kilometers, leaving just 1 km remaining. That final kilometer felt endless. We arrived in Henley, feeling hot, irritated, and fatigued, navigating through the streets until the finish line was just 100 meters away. Shortly after 10 am, 27 hours after leaving Putney, I finally crossed the finish line, exhausted yet overwhelmed with joy for having completed my most challenging endeavor so far.


The medal hung around my neck, a glass of bubbly in my hand; it was time for photos with Monic and her lovely family!


100 km completed, after a well-earned rest, I hobbled my way to the train station, another very long mile when your legs and feet are aching, stiff, and worn out! Back to London and my hotel.



The Early Hours: Setting Out with Determination


Starting a 100-kilometer journey is no small feat. The early hours were filled with anticipation and a steady rhythm. Each step was measured, each breath controlled. The excitement of the challenge ahead pushed me forward, but I knew the road would test every ounce of my endurance.


The first 50 kilometers passed with a mix of adrenaline and focus. I kept reminding myself to pace well, conserve energy, and stay hydrated. The landscape shifted gradually, and the quiet moments on the trail gave me time to reflect on why I had taken on this challenge.


The Struggle Nearing the End


By the time I reached 99 kilometers, the physical and mental toll was undeniable. The last kilometer felt like it stretched on forever. My body was screaming for relief, but my mind refused to give in. The heat weighed heavily on me, and irritation crept in as fatigue set deep into my muscles.


Navigating the streets of Henley was another challenge. The unfamiliar surroundings and the crowd made it harder to focus. Yet, the finish line was close—just 100 meters away. That small distance became a beacon of hope and motivation.


Crossing the Finish Line: A Moment of Triumph


Crossing the finish line after 27 hours was a powerful moment. Exhaustion mixed with overwhelming joy. The medal around my neck symbolized more than just completion; it represented perseverance, strength, and the will to push beyond limits.


Holding a glass of bubbly, I shared the moment with Monic and her family. Their support made the journey even more meaningful. Celebrating with loved ones after such an intense experience reminded me why challenges like this matter.


The Aftermath: Rest and Recovery


Completing 100 kilometers is only half the battle. After a well-earned rest, the journey continued in a different way. Hobbling to the train station was unexpectedly tough. When your legs and feet are aching, stiff, and worn out, even a short distance feels like another long mile.


Returning to London and my hotel was a relief. The comfort of a bed and a quiet room helped my body begin to heal. Recovery after such an effort is crucial, and I made sure to take it slow, listen to my body, and give myself time to regain strength.


Lessons Learned from the Journey


  • Pacing is key: Starting too fast can lead to burnout. Keeping a steady pace helps maintain energy over long distances.

  • Mental strength matters: Physical endurance is important, but the mind often decides how far you can go.

  • Support makes a difference: Having friends or family to share the experience adds motivation and joy.

  • Recovery is part of the process: Rest and care after the event are essential to avoid injury and prepare for future challenges.


Final Thoughts


Completing a 100-kilometer journey is a test of body and mind. The fatigue, the heat, and the long hours on the road all fade when you cross that finish line. It’s a reminder that pushing through discomfort can lead to moments of pure triumph.


If you’re considering a similar challenge, remember to prepare well, pace yourself, and cherish the support around you. The journey will be tough, but the reward is worth every step.


This 100-kilometer hike along the Thames under a heatwave was a powerful reminder of the challenges long-distance hiking presents. It tested physical limits and mental resolve, but also offered moments of beauty, camaraderie, and achievement.



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