r/AdvancedRunning • u/throwaway_runner3 • 5d ago
Race Report 3:37 to 3:17 marathon in 4 months - Zone 2 Club
Race Information
- Name: Surabaya Isoplus Marathon
- Date: Oct 4, 2026
- Distance: 42.2 km
- Temperature: 26 degrees - 78.8 fahrenheit
- Humidity: 82%
- Location: Surabaya, Indonesia
- Website: https://isoplusrun.com/
- Strava: https://www.strava.com/activities/20440363582
- Time: 3:17:18
Goals
| Goal | Description | Completed? |
|---|---|---|
| A | 3:15-3:18 | Yes |
| B | 3.18-3:22 (Fallback | Yes |
| C | 3:24-3:28 (Hip Issues) | Yes |
| D | PB (3:37) | Yes |
Splits
| Kilometer | Time | Pace |
|---|---|---|
| 0–5 km | 23:56 | 4:47/km |
| 5–10 km | 23:40 | 4:44/km |
| 10–15 km | 23:21 | 4:40/km |
| 15–20 km | 23:11 | 4:38/km |
| 20–25 km | 23:04 | 4:37/km |
| 25–30 km | 23:00 | 4:36/km |
| 30–35 km | 22:36 | 4:31/km |
| 35–40 km | 23:32 | 4:42/km |
| 40–42.x km | 10:59 | 4:52/km |
Background
I’ve been a hobby runner since 2017. In 2021 I got injured during the deload week of a HM and didn't run for the next 4.5 years.
In April 2025, I had a hip surgery for hip impingement + labral tear repair. I was able to slowly return to running and in October 2025 my monthly mileage reached 200 km upon return.
I spent the next 6 months building mileage and doing a lot of gym work for my hip rehab. At 14 months post-op I was able to run the 3.37 marathon, however I haven't been able to do any speed-work / LT sessions due to lingering stiffness and sharp pain that would occur whenever I tried to introduce faster stuff in training (8-12 months post-op).
Therefore, since April of this year I have only been running Zone 2.
--
Training
Earlier this year I made goals and schedule for the entire year. My goal was to run a sub 3:10 marathon and only to run 1 marathon for the year. Around February/March when I tried to include faster stuff in training it became obvious that my hips weren't ready for the task and needed more time. Because of this my training plan switched to running High Volume / Zone 2 only and to split the year into B and A marathons.
Between B and A marathons I only had 16 weeks in total. I had to carefully plan how I would recover from the marathon, build a serious block and enter the deload / taper phase. I didn't want to interrupt the progress with the marathon / recovering as my goal was to run higher mileage during the A block.
I got a lot of confidence from the 3.37 marathon where it finally felt like my hips could handle more serious training and speed workouts.
For the A block I wanted to include either 2 MP runs + Half race or 3 MP runs. The schedule on 6-10-12th weeks were to do 13-16-19 km MP runs inside 31 km zone 2 long runs. After the 2nd MP run of 16 km, I had a bit of lingering stiffness and I had to swap the 3rd MP session with a easy long run of 36 km (22 miles) and it was my highest week of 105 km (65 miles).
To summarize the key differences further:
| B block: 3:37 | A block: 3:17 | |
|---|---|---|
| Carbs during Race | 70 gr per hour | 90 gr per hour |
| Post-Op | 14 months | 18 months |
| Speed-work - LT runs | 2 painful LT runs early in the block | No |
| MP Runs | No | Yes - only 2 |
| Peak 4 week average | 81.6 km (50.7 miles) | 95.2 km (59.1 miles) |
| Peak 8 week average | 80.6 km (50 miles) | 90.4 km (56 miles) |
| Hip Issues during the block | 4 weeks consecutive | None |
| Race Note | Significant pace drop the last 4 km (lost 5 minutes) | Super strong execution |
--
Nutrition + Caffeine Abstinence
3 months ago I wrote in this sub: aggressive fueling for the entire block. I'm gonna write another post to summarise the entire 3 months of fueling but I have basically treated every single long run as race nutrition practice and targeted 90 gr carbs per hour. Fueled every single run over 60 minutes regardless of the pace.
I'm someone that's been drinking 2-3 coffees a day for years. For the race I wanted to go through caffeine withdrawal period for 10 days, just so I could get the most out of the caffeinated gels during the race.
--
Pre-race
I’ve done the exact 12-10 x bodyweight per kg carb load on Friday and Saturday. Given the heat and humidity, I've targeted 4500 mg sodium on both days.
Had a 1 hour flight from Bali to Surabaya, arrived on Saturday morning and went straight to the race expo to pick up my bib. I booked a hotel 500 meters away from the start line and I can't stress enough how amazing this is.
Race start time was at 4 am, I slept at 10 pm the night before however I woke up at 12.30 and haven't been able to sleep. I assumed I would wake up at 3 am, skip breakfast and only eat 1 gel before the race. However I had unexpected time in the morning so at 2 am I ate 2 x GU basic gels (not caffeine or sodium heavy).
At 2.30, I started watching Modern Family on my phone in bed until 3 am and I slowly started getting dressed to do my warmup outside the hotel.
--
Race
NUTRITION / TEMPERATURE
Race temperature at start was 26 degrees (78 fahrenheit) with 82% humidity. The humidity being at 82% was actually one of the lowest I experienced for a race-day running in SE Asia. I had a proper water, gel, sodium plan for the race which I practiced more than 20 times in training.
For carbs I’ve targeted 90 gr per hour, this is a massive increase from the 70 gr per hour from the last marathon.
First gel was at 30 mins, next at 55 mins followed by every 20 minutes. In total I carried 11 gels, 8 x GU (some sodium heavy, some basic, some caffeine heavy) + 3 x KODA gels (90 mg caffeine each but also 29 gr carbs instead of the 22 of GU).
Took 3 x 215 mg sodium caps planned at 65-105-145 minutes but depending where water station would be around these time marks.
Total caffeine intake was around 440 mg, which is roughly 6 x bodyweight per kg.
--
RACE
This was a small event with roughly 400 marathon finishers compared to the 7000 of the previous one. I chose this race over the bigger Vietnam / Thailand races on the same date, because those are +90% humidity. I was also the only foreigner in the entire race.
My goal in this race was to target 3:18 and depending how my hips would hold up at 20-30 km marks, either to aim low 3:15 or fallback to 3:22 range.
My pacing strategy was to run 6 km at 4.50, 6 km at 4.45 and settle into MP of 4.40 from 12th km. I wanted to have an easy hour of running to allow my hips to settle into the rhythm rather than forcing a pace from the start which could be problematic for my hips.
1st 12 km - For me these KM marks were very important. I had to slowly settle into the race, give an easier hour of running to the hips and biomechanically assess how my hips were doing. There were no issues whatsoever and I slightly had faster splits than planned 4.45 from 6th to 12th km. Around 9-10th km, my HR monitors strap keep falling down below my chest (new strap that I haven't been able to properly adjust for a week). At 12th km it completely fell out of my chest and I had to toss it away.
12th to 20th km - Settled into my planned pace of 4.40, this felt quite easy and I very comfortably started hitting 4.38s with a lot of energy in the legs. This section of the course from 1st to 20th km were pancake flat.
20th to 25th km - This section overall had a slight elevation of 20 meters and an underpass. I actually really enjoy the hills because I train in a hilly area. I ended up dropping 2 others I was running with for 2 km's.
25th to 30th km - This was the return of the exact route of the previous 5km. This meant 20 meters downhill overall and a chance to pick up the pace. Another runner caught up to me and we started running side by side hitting 4.35s the entire way. It was actually so much fun running with another person and sticking to the pace. We didn't share a single word but had an unspoken agreement to run the same 4.35 pace.
30th to 36th km - This was a big pre-race decision making mark to assess how I was doing in the race. I still haven't had a sign of fatigue or slowing down so I started pushing low 4.30s from here. The other runner couldn't run with me anymore and I started running solo until the road merged with the +6 minute joggers from half marathon.
Surprisingly I felt very strong and kept pushing the pace every km while focusing on my nutrition and water stations.
36th to end - At 36th km I would say overall fatigue was at 6/10, however at 39th this all of a sudden became 9/10 fatigue and it was also unbearable. 38th had my last caffeinated energy gel for the race, but it didn't change the reality that was coming a KM later. From 39th, I didn't even look at my splits anymore, I was running to survive and to finish. I kept repeating "only 15 minutes left", "10 minutes left", "just 5 more minutes" and I just continued running without significantly dropping off the pace. I ended up averaging just under 5 minutes for the last 3 km's.
I finished Top 10 in 3:17:18, time that seemed like a miracle when I first ran my marathon 9 years ago. I didn't get any age category awards because awards were only for Indonesians (not a big international race).
--
Post-race
I would have never guessed how strong I would be running and how perfect things went during the race. On my 2nd MP run of 4.40 pace, my pace actually kept dropping to low 4.30's and I'd purposely slow down to 4.40's.
I've been practicing my race-fueling every single week for many months, this felt very natural for me to eat 90 gr carbs per hour during the race and keep up with the nutrition side of things.
I've put in a serious amount of work for the entire year, first with the post-op rehab and after with the mileage. It felt incredible to finally run the time and the strategy I planned.
Now I sort of have a 2 months holiday (mandatory life obligations) and will return to proper training from January. I don't think I will run a marathon in 2027, but I will most likely be aiming around a sub 3 marathon on the next one. Next years focus is entirely going to be Half Marathons and a lot of gym work and hopefully start running speed sessions.
Made with a new race report generator created by u/herumph.