The Ironman Thun '26 Journey

(last update December 2025)

Intro

Bit the bullet on Ironman registration, finally. Want to see if I’ve got the long stuff in me.

I want to chronicle the journey, wherever I take it. Fundamentally, I want to do this my way, that is:

do it for the sport, avoid all the fads and bullshit
do it without a coach. I am open to advice from friends, I just don’t want to have to deal with yet another false-guru guy regularly.
listen to my body and stop if things (aches, feeling tired) are tipping towards getting out of hand

I am a hardcore hobbyist, so no products I mention are sponsored. My tendency is to be unhappy with any product I get, so it wouldn’t make sense anyway. Read on, you’ll see.

Guiding Principle

Maximize the chance of getting to the start line in Thun on Junly 5th in one piece.

It is better to show up undertrained than injuired.

Said the great man who coached me as a junior orienteerer, I’ve lived by that ever since, and when I strayed I regretted.

Consequently, there is no hard performance goal, crossing the finsih line would be huge. Soft performance goal maybe: getting it all over with in 11.5 hours total.

I’ve split the preparation into two epochs: winter epoch, where I try to gain a bit of weight in gym while maintaining bike FTP, swim once a week and regularly check 5k running best effort. This is to make sure that I start the second and main epoch fit, with a buffer of weight to shed and not hopelessly slow in either discipline.

Nov 17, Week 1 of the winter epoch

Started GZCLP in the gym. Goal is to go from 66.5 kg to 70 kg before March. Putting my numbers in an app. Am I too old to be that nerdy in the gym? The app is pretty good. GZCLP looks like the state-of-the-art bro science too.

Shotout GIBU GYM Brno. Best we’ve got. The motivationals on the wall are something to behold.

Dec 9, Mid-Week 4 winter epoch

Turbo test on the bike, all wattages are down. Kinda expected. Can hold 20 minutes for 229W now. Weight stagnant. Left foot slight pain when running, I hope it’s not the metatarsus.

Using all the Black Friday deals to get the remaining cycling material sorted. Got the basic Keo Blades. They arrived with only the 8 Nm retention blades. But normally people need 12 Nm, that’s another €30.

Destroyed my 15 year old MTB shoes two weeks ago. Getting new ones too. My usual Northwave sizing was off, sent them back, getting Specialized again. It’s like 30% cheaper to get two pairs (for sizing assessment) sent from Germany with no discount than getting them from the local shop with regular customer discount. Much bullshit with anything Specialized, fingers crossed the sizing hasn’t changed in those 15 years and they’ll work out. I don’t expect to MTB much after March so need to start enjoying it ASAP.

Dec 14, Week 4 of the winter epoch, summary

Swimming fitness test, 3 km in 58:10 in a 25m pool. Happy. Little motivation to sink much more time into swimming. Gained some weight to 68.4 kg, which is welcome. Woke up with headcold Sunday morning which will impact next week. This is expected for me during and around Christmas, it’s that slightly-above-zero temperatures (and maybe not sleeping enough past week).

The bike I got to do this is my first Thru-axle. Means lots of the gear I’ve got I need to replace. Starting with Thule roof rack adaptors (not stocked since September, about €60 per bike). We needed a new system to attach wheels to frames like we need teeth in our asses. Other than that, I can recommend the Thule FastRide. I now drove more then 4k km with bikes on this roof rack. Never a problem, I just have to look out so I do not to end up like this guy.

Dec 17, Week #5 of the winter epoch, mid-week rant

Finally found solid two hours to spend toying with the new bike. Both di2 shifting and 4iiii power meter need a phone app to check the battery status. They ask one to create an account too, with 4iiii it cannot be skiped. Their B-player tech consultants advised them poorly when they promised that harvesting bunch of useless user data will bump the stock/acquisition price.

And the app to check the di2 is not called ‘Shimano Di2’. Believe it or not, it’s called E-Tube Project Cyslist. The user experience it offers is on par with the naming. Everything that happened in road cycling after ~ 2005 is bullshit and Di2 is its current pinnacle.

Good news is that the Di2 battery charges (which I hear is far from guaranteed).

Dec 20

Plagued with headcold first half of the week. All sorts of small aches, I blame the gym. Also, solid quality sleep, but not quantity, something to improve on, and soon.

Satuday 5 km time trial run, 19:45. Very pleased given everything. Fast course, the Hyperions are fast as well. Could be drier, could have been fitter.

A friend says my run is spasmic. He’s not wrong.

Bored on the turbo, so did my first over-unders in 3 years. It is not boring, I give them that.

Dec 28, Week #6 of the winter epoch, summary

Not doing that well in the pool and in the gym, suffering from some muscular back aches. Heard on a (targeted!?) YouTube ad that gym wrecks you after 40, so there’s that.

Ground finally froze this week, which enabled two glorious MTB sessions on the trails.

6 hours of endurance training this week, most from the winter epoch so far, and no need to go higher than that during January.

Dec 29, injured elbow

Five minutes into the second 800m swimming interval this morning my elbow started to hurt on the outside, and so I bailed. It’s the dumbell rows yesterday, I swear.

This is another deal I’ve made with myself a long time ago: bail quickly if something hurts the wrong way. The injury has already happened and pushing through will only make the recovery longer and the problem peskier.

Knowing when to call it a session is the hardest part in triathlon. It’s worse than the worst intervals or FTP tests. An FTP test feels good when it’s over. But I feel shit all day for pulling out of a session soon because of an injury. Like I’m slacking plus not sure when I’ll be in the pool again.

Jan 4, Week #7 of the winter epoch, summary

Amazing mountain biking with a friend in the snow on New Year’s. Great for testing where my technical limits are, and they are low. For starters, and this is an oldie&goldie, I should stop touching the brakes unless moving in a straight line.

One solid over-unders turbo session. Easy snowy run with another friend. Missed a planned 5k run test due to family obligations (also there’s snow and ice near damn everywhere). But it’s all gravy, because the main lift is still way out.