Race Report Istanbul Marathon 2026 - 15.5K The Preparation, the Fatigue, and the Expected Outcome
Some races end with you crossing the finish line and immediately checking your watch. Others are races where, deep down, you already have a pretty good idea of how things might turn out before you even reach the starting line. The 2026 Istanbul Marathon was the second kind for me. I had been preparing for this race for almost two months. I had a clear goal, a structured training plan, and encouraging results that showed I was making progress. My target was to complete the 15.5K course in 1 hour and 9 minutes. However, as race day approached, I could feel the accumulated fatigue in my body. I knew my fitness had improved, but I was also aware that I wasn't arriving at the starting line as fresh as I wanted to be. So, in the end, the result wasn't a complete surprise. I finished 15.56 kilometers in 1:11:43, with an average pace of 4:37/km. It was slower than my target, and after the 12th kilometer, my legs simply didn't have enough left. Looking back, I had already felt the warning signs before the race.
After spending August at an MMA training camp in Dagestan, I gradually shifted my focus back to running. No matter how strong you are in other disciplines, if you haven't been running consistently, you will eventually feel it, especially over longer distances. The Merrell Istanbul Ultra 15K in early September had already given me a useful reference point. That's when I decided to make the 15.5K event at the Istanbul Marathon my next target. The goal was 1:09. That meant maintaining an average pace of approximately 4:27/km. It wouldn't be easy, but with consistent and structured training, I believed it was achievable.
Throughout September and October, my training was built around three key sessions: intervals, tempo runs, and long runs. I continued swimming and strength training alongside my running schedule. I started with 4×1,000m repetitions in mid-September and gradually introduced sessions such as 6×800m and longer intervals. The purpose wasn't simply to run faster. I wanted to improve running economy, become comfortable at speeds faster than race pace, and develop the ability to recover between hard efforts.
As the weeks passed, I noticed that I could handle faster paces with greater control.
I included 25-minute threshold runs, 5K tempo sessions, and longer repetitions such as 2×3K. For me, these were among the most valuable workouts of the entire preparation period. A 15.5K race isn't just about speed. It's about developing the aerobic capacity and muscular endurance required to maintain that speed over a sustained period.
My weekly long runs gradually reached approximately 15 kilometers. Throughout the training block, I could feel my running rhythm improving. My fitness was developing, and I was becoming increasingly confident about my target. I think I should have run more longer distances. However, running wasn't the only physical demand in my life. Swimming, strength training, work, and everyday responsibilities all continued.
And while I was managing the training itself reasonably well, recovery was becoming a different story.
One of my most important tests before the Istanbul Marathon was the Bosphorus Run on October 18. I completed 10.5 kilometers in 46:25, averaging 4:27/km. More importantly, I felt that I had run the race in a controlled manner. That result gave me confidence. A pace of 4:27/km was exactly what I needed to achieve my 1:09 target over 15.5 kilometers. Of course, running 10.5 kilometers and maintaining the same pace for another 5 kilometers are two different challenges. Still, considering my recent workouts and the progress I had made, I believed the goal was realistic. I still believe so. I was happy with my running fitness. The problem wasn't my preparation. It was a perfect plan with consistency. It was the fatigue that had been building up as race day approached.
The days leading up to the race were extremely busy. Between Republic Day celebrations on October 29, work commitments, everyday responsibilities, and my daughter Arya's swimming competitions, there wasn't much room for proper recovery.
Although I had reduced my training volume, I didn't feel fully recovered. I could sense the accumulated fatigue in my muscles and overall energy levels. And I knew it could affect my performance. That's why what happened during the race wasn't entirely unexpected. I wanted to see the results of the previous two months of training, but I also understood that race-day performance depends on more than just the workouts you've completed. Recovery is part of training too.
The race was scheduled to start at 9:15 a.m. I had eaten well the previous day, but my race-morning nutrition wasn't particularly structured. I had a banana before heading to the start. I wasn't hungry, but I didn't feel completely fresh either. Nevertheless, I decided to stick to my original goal. The plan was to find my rhythm early, avoid getting caught in the crowds, stay controlled through 10 kilometers, and maintain my pace over the final 5 kilometers. In a race of this distance, I knew that avoiding major time losses in the final kilometers mattered more than gaining a few seconds at the beginning.
The opening kilometers felt good. Despite the crowds, I managed to settle into a rhythm. My breathing was controlled, and I was running relatively close to my target pace. I reached the 10K mark in approximately 45 minutes and 18 seconds. That was an average pace of around 4:32/km. Slightly slower than planned, but I still felt that the race was manageable. Kilometer 9 was 4:32. Kilometer 10 was 4:36. If I could maintain the pace and finish strongly, a respectable result close to my target was still possible. But feeling good during the first part of a race doesn't necessarily mean that the fatigue you've accumulated has disappeared. And soon enough, I was reminded of that.
Around the 10th kilometer, the course narrowed. The crowd became denser, and I was forced to adjust my speed as runners gathered in front of me. My pace dropped to 4:52/km during kilometer 11. Under normal circumstances, one slower kilometer shouldn't be a major issue. You lose a few seconds, regain your rhythm, and continue.
That's exactly what I tried to do. I ran kilometer 12 in 4:33. On paper, it looked like I had recovered. But physically, getting back to that pace had taken more out of me than I expected. My legs no longer responded the way they had during the first 10 kilometers.
The accumulated fatigue was beginning to show.
The hardest part of the race began after the 12th kilometer. It wasn't simply a mental struggle. I genuinely couldn't accelerate. My legs felt heavy, my stride was losing power, and maintaining the pace I wanted became increasingly difficult.
Kilometer 13: 4:49
Kilometer 14: 4:53
Kilometer 15: 4:48
At that point, I wasn't thinking about my original target anymore. I was simply trying to avoid slowing down any further. The fatigue I had felt in the days leading up to the race was now affecting my performance exactly as I had feared. Interestingly, I was still able to accelerate over the final 560 meters, averaging approximately 4:17/km according to my watch. So there was still enough energy left for a short finishing effort. But that didn't change the fact that I hadn't been able to sustain my target pace over the final kilometers.
Istanbul Marathon 2026 — Race Summary
Metric | Result |
Distance | 15.56 km |
Finish time | 1:11:43 |
Average pace | 4:37/km |
First 10K | ~45:18 |
Target | 1:09:00 |
I crossed the finish line knowing I hadn't achieved my goal. But I wasn't particularly surprised. I trusted the progress I had made during training. At the same time, I had already felt that my body wasn't fully recovered before the race. That's why I don't see the slowdown in the final kilometers as an isolated race-day problem. To me, it was more a reflection of the physical load I had carried into the race. The congestion around kilometer 10 and the disruption to my rhythm certainly didn't help. But looking at the entire race, I believe accumulated fatigue was the biggest factor.
Were those two months of training wasted? Absolutely not. When I compare my running fitness at the beginning of September with where I was in November, the improvement is clear. I can handle interval sessions with greater control. Tempo runs feel more comfortable. My confidence at faster paces has increased. The 10.5K Bosphorus Run on October 18 was a concrete example of that progress. The Istanbul Marathon result doesn't erase any of it. It simply means that my physical condition on race day didn't allow me to fully translate that fitness into performance. Shit happens.
After years of participating in different endurance sports, I've experienced this many times. Sometimes you prepare well, but your body doesn't respond the way you want on race day. And when you're balancing work, family life, swimming, strength training, and running, it's important to consider not only your training load but your overall life load as well.
I'm not changing my running ambitions because of this race. I'm happy with what I achieved during the two-month preparation period, but I want to arrive at my next starting line better recovered. Intervals, tempo sessions, and long runs will remain essential parts of my training. However, I also want to pay more attention to the balance between training stress and recovery. Because sometimes improvement doesn't come from doing more. It comes from giving your body enough time to absorb the work you've already done. And I believe that was the missing piece this time.
The 2026 Istanbul Marathon didn't end with the result I wanted. My 1:09 target remained out of reach, and I finished in 1:11:43. But considering how I felt in the days before the race, the outcome wasn't surprising. I knew I was tired. I knew that fatigue could catch up with me in the later kilometers. Still, I stood on the starting line, went after my goal, and gave what I had on the day. The previous two months had helped me rebuild a solid level of running fitness, and I see this race as another part of that process. Looking back, I'm not focusing only on the finishing time. I'm looking at the entire journey. The workouts completed, the fitness gained, the racing experience, and the goals still ahead.
They're all part of the bigger picture. One race not going according to plan doesn't take away the value of two months of hard work. I'll be back on another starting line soon.
Hopefully, with fresher legs next time.
See you at the next starting line.
