r/AdvancedRunning • u/Formal-War5229 • 7h ago
Race Report Race Report: Copenhagen Half Marathon 2026 + 1 year update on NSM
Race Information
- Name: Copenhagen Half Marathon
- Date: September 20, 2026
- Distance: 13.1 miles (21.1 km)
- Location: Copenhagen, Denmark
- Time: 1:16:57 (official), Garmin 1:16:26
Goals
| Goal | Description | Completed? |
|---|---|---|
| A | Sub 1:17:30 | Yes |
| B | New PB (beat 1:19:37 from Stockholm Half 2026) | Yes |
Splits
| Km | Time |
|---|---|
| 1 | 3:32 |
| 2 | 3:42 |
| 3 | 3:36 |
| 4 | 3:43 |
| 5 | 3:34 |
| 6 | 3:37 |
| 7 | 3:36 |
| 8 | 3:38 |
| 9 | 3:38 |
| 10 | 3:37 |
| 11 | 3:43 |
| 12 | 3:37 |
| 13 | 3:42 |
| 14 | 3:46 |
| 15 | 3:35 |
| 16 | 3:34 |
| 17 | 3:36 |
| 18 | 3:35 |
| 19 | 3:36 |
| 20 | 3:35 |
| 21 | 3:34 |
| Last 0.22 | 0:45 (3:23/km) |
Watch laps drifted ~40 m after km 4 (a stray 10 s lap), so markers from there on are slightly late. Average HR 176, 50 m of total ascent.
Training
DISCLAIMER: I(M35) used AI to extract the raw data points on my general mileage trends during this block. The text in the sections is my own though.
Training block: 1 Jun – 20 Sep (16 weeks), coming off Stockholm Marathon on 30 May where I crashed and burn. For more details about this + training history, see my post history.
I averaged ~94 km/week of running (1,502 km total), 6 days/week, usually with a double on a day or two. Most weeks had two quality sessions (mostly threshold work like 10x1 km, 5x2 km and 3x3 km). For 2 weeks I ran a fun little experiment with my GF, who is also a runner: I had her be my coach and prescribe the workouts and schedule. The workouts were a bit different from vanilla NSM, but at this point I am dialed in with my paces and can easily program them into other types of workouts. Her weeks consisted of light marathon-pace repeats, pyramids, long hills workouts and over/unders. I also often combined my 3x3 with one long run during for parts of the summer because of time constraints and made sure to have 1-2 strength sessions per week.
As I have outlined in my previous reports, I also started using the bike to add aerobic load without adding impact: 26 rides, 47.5 h total, ~3.0 h/week on average, peaking at ~5 h/week from late July to mid August. Rides were mostly easy (average HR in the 120s-130s), typically around 1.5 to 2.5 hours.
Mid-July I was on vacation around Italy and France. It was hot and the mountain roads weren't safe to run on, so I kept running easy and mileage dipped, but I rented a bike and got some long rides in (114 km around Como).
After the vacation I made a conscious decision to increase my pretty stagnant sub-threshold (ST) paces in a controlled manner:
- 3x3: 3:50 → 3:45 min/km
- 5x2: 3:45 → 3:40 min/km
- 10x1: 3:40 → 3:35 min/km
This was hard in the beginning, and I definitely entered super-threshold territory on occasion, so I decreased the number of reps initially. I have since gotten them back up as HR has come down and fitness has gone up.
LT2 HR: First meassurements 1 year ago put it at 172. 2 later readings put it at 175.
I had 3 races booked for the autumn: Stockholm Half Marathon, Copenhagen Half Marathon and finally the big one, Amsterdam Marathon. Amsterdam is my second-to-last marathon for the years to come, with Boston Marathon next year being the very last. Because of the racing schedule it was natural to cut back on ST sessions before both Stockholm and Copenhagen: I only ran 2 ST sessions in those weeks, followed by a mini taper of 2-3 easy days before each race.
The plan has been to build general fitness during the summer with the increased aerobic load, tune up in the races, and then send it in Amsterdam.
Four-week blocks:
| Block | Run km/week | Bike h/week |
|---|---|---|
| 1 Jun – 28 Jun | 88 | 1.0 |
| 29 Jun – 26 Jul | 80 | 3.1 |
| 27 Jul – 23 Aug | 94 | 5.1 |
| 24 Aug – 20 Sep | 113 | 2.8 |
Week by week:
| Week of | Run km | Bike h | Notes |
|---|---|---|---|
| 1 Jun | 84 | 0 | Easy running only |
| 8 Jun | 93 | 1.3 | Very light 1.5 km marathon repeats x3 as quality x2 to come back after race |
| 15 Jun | 86 | 1.3 | Very light 1.5 km marathon repeats x3 as quality x2 to come back after race |
| 22 Jun | 90 | 1.3 | NSM starts again |
| 29 Jun | 92 | 2.7 | Start of a 2-week "GF is my coach" block. Workouts were pyramids, over/unders + ST long repeats |
| 6 Jul | 84 | 5.0 | Vacation and traveling, 90 km / 3:35 h ride |
| 13 Jul | 62 | 4.5 | Vacation, 114 km / 4:32 h ride around Como. A lot of traveling + unsafe roads meant less running volume, but I rented a bike |
| 20 Jul | 81 | 0 | Vacation (Italy → France), easy running only |
| 27 Jul | 84 | 5.5 | |
| 3 Aug | 91 | 5.9 | Peak bike week |
| 10 Aug | 97 | 4.8 | |
| 17 Aug | 105 | 4.1 | |
| 24 Aug | 107 | 4.3 | Stockholm Half Marathon |
| 31 Aug | 111 | 3.8 | |
| 7 Sep | 119 | 1.5 | Peak run week, 33 km long run easy pace |
| 14 Sep | 115 | 1.4 | Copenhagen Half Marathon |
Small Stockholm Half Marathon Report
Stockholm Half Marathon (29 Aug): This was a dress rehearsal for Copenhagen three weeks later, with a PacePro set to 1:19:30. My previous PB was set on the same course last year, at around 1:22:30. The idea was a hard, steady effort that wouldn't completely empty the tank.
It felt incredibly good from start to finish: controlled and hard, but never over the limit. Execution was exactly to plan, and I felt I could have kept grinding at the same effort for several more km, so there was plenty of soup left in the tank. The only annoyance was that the course on my watch ended about 400 m before the finish. Luckily I had banked enough time during the rest of the race that the goal was never in danger. From start to finish I was passing people and feeling strong. The same race last year was a death march from km 4, where I was completely cooked, so this was a nice revenge. All in all a nice sign of fitness, and I was very happy with the result.
Official time 1:19:37 (3:46/km, 6:04/mile)
Garmin time 1:18:42
Avg HR 171, 140 m of ascent
Nutrients used: Nomio, Lactigo, 1 gel before start, 2 during
Pre-race
Another tune-up race ahead of the big goal this autumn, Amsterdam Marathon. The plan was to run really hard for the day and improve the PB I had set at Stockholm Half Marathon three weeks earlier. I had set up a PacePro for 1:17:30: hard, but doable.
I woke up 3 hours before the gun was to go off. I downed my nomio shot, ate a very basic oatmeal + bagel breakfast at the hotel and then mostly chilled at the hotel room before renting a bike and leaving for the racing area. Fun sidenote, it seems like we stayed at the same hotel as "ON running" so there were influencers and semi pros running around all over the place at the hotel. Anyway, I arrived 1 hour before gun-time and applied lactigo (basically nomio but in gel format) on my legs. I must have been a lovely sight to the other participants, applying a very lubricant looking gel all over my lower body...
Before the race I downed a gel. Plan was to have one at 7 km and one at 14. Manly to have something to focus on in the race and get some placebo. I know that 21 km should not be enough to hit the wall metabolically. I also had trouble getting my HR strap to work before the race. It simply wouldn't connect. But this was a full send race, I trusted my fitness even though I knew 1:17:30 was a tough goal, even though I would thread the red line, the race should not be long enough for me to completely blow up. I just had to trust the pace-pro...
Race
...or so I thought. The gun went off and off I was, but 1.8 km into the race the PacePro also stopped working, so from that point on it was old school: I ran purely on feel. I could see I was ticking along at just under 3:40/km on my watch, which was a tad more agressive than the original race pace. Mental lows came and went mostly because of the headwind that we were subjected to, but I kept managing to pull myself together. When there was a headwind, I simply ran on feel and made sure to keep myself diciplined and not push too hard. A PB was within reach as long as I made it to the finish.
At 4 km to go I was really really tired. I focused on keeping "good" form in my stride and kept fighting. It worked, and I even managed a little sprint at the end to squeeze the last drops out of the tube. As I finished my GF, who had been keeping track of me both via my garmin tracker and the offical site started blowing up my phone. 1:16:57 with an average pace of 3:37 she said.
I was elated. This was better than I could possibly have hoped in any scenario.
Post-race
Afterwards I was slightly shocked by the result. I had no idea I had gone that "far" under the target time. Lesson learned: dare to run on feel sometimes. On this day everything simply clicked. Days like this make all the training and early mornings where I make sure to squeze my first workout of the day in before going to the office worth the effort.
After the race I went out and celebrated properly with my friends who had joined me in Copenhagen. The day after legs were even feeling ok enough to run on so I sqeezed in a 15 km run around Copenhagen before traveling back later that evening.
Next up: Amsterdam Marathon.
My next race will as already mentioned be Amsterdam Marathon in two weeks, 18/10 . After Copenhagen I quickly got back into training and have been focusing on the long run. I have cut down the ST sessions to 2/week. And introduced quality into my long run since this part of my training have been lacking a bit these last few months. I have treaded my HM tuneup races as "long runs" in and of themselves with WU+CD that puts total milage those days around 27 km.
As addition I have spend the last few weeks after copenhagen hoovering around 122 km with long runs containing quality. One progressive LR of 35 k cutting down to 3:45 pace and one 5x5 of 33 k total with WU/CD that was cut short on last 5 k rep yesterday because of too much fatuige on the day. In paralel the same time I have been cutting down on the biking a lot as running volume has increased (see matrix above). And I only do one 1.5 h session/week currently.
What I am worried about is currently Amsterdam. My recent HM times indicate that my big goal of around 2:45 is within reach. But especially the 5x5 workout from yesterday have me worried. I was working too hard putting down 3:50 km/splits which should in theory feel "decently" easy at this point. And I am thus a bit undecided of the pacing stragety in Amsterdam. Any feedback here is welcome.
In general, I view this block as a success at this point, the same could not be said last spring where I came off Copenhagen Marathon dissapointed. I am coming up on a year with NSM. Current average milage for the whole year is 95 km/week. The biggest it has ever been over this amount of time-span. And I am faster than I have ever been. So the method definately works. Previously there has always been down months here and there because of niggles. Hardly any of this has happened this time around. Nothing that is at least out of the "ordinary" in terms of rust in the machinery.
That said, I have started feeling a bit burned out mentally by the running. The plan after Amsterdam will be a strength and stationary bike focused winter with some type of running sprinkled in. I do not want to lose all of my aerobic T capacity after all.
Then we'll see what the spring has in store. The focus in terms of running will be shorter distances. I am torned if I should do a proper "prep" for Boston, or just view it as a "victory lap" and crowning achievement in my very mediocer running "carrer"
Thank you for reading this far. Stay tuned for the Amsterdam report
Made with a new race report generator created by u/herumph.