Ljubljana Half Marathon Training Plan & Preparation

Course & Elevation

The half marathon of the NLB Ljubljana Marathon runs 21.1 km through the Slovenian capital. It starts on Slovenska cesta in the centre and finishes at Kongresni trg, heading through the northern districts and once around Rožnik, the hill just west of the centre, yet stays flat throughout: only around 55 metres of gain over the full distance, with more than 80 percent of the course flat.

This is a classic fast city course, no real climbs and no technical sections, just wide roads and a narrow elevation band between roughly 294 and 315 metres. The Ljubljana Marathon is one of the largest running events in Slovenia and fills the city centre with a big international field every October. For anyone chasing a half-marathon personal best the conditions are ideal: a flat, easy-to-read profile that rewards pace and forces almost no changes of rhythm.

Pacing Strategy

The course is flat but not perfectly level: over the first eleven kilometres or so it climbs very gradually by about 17 metres before dropping away in the second half and running flat back to the finish. That split dictates the strategy. Run the gently dragging first half at your planned target pace and resist the reflex to compensate for the barely perceptible rise with more effort — that is exactly where many lose substance early. The freshness you save pays off after kilometre 11, where the slight downgrade allows a touch more speed at the same effort. With 83 percent flat, there is no hill to recover on; it all comes down to even distribution of energy.

The main trap is too fast a start on the wide, flat road in a large field.

The race is decided in the descending final third: run the first half within yourself and you can close on a negative split.

12-Week Preparation

Depending on your level you will be out on the half marathon for roughly 1:20 to 2:10 hours. On this flat course the effort is very even: one long, brisk sustained run around anaerobic threshold, with no climbs to break the rhythm and no descents to recover on. That makes the half marathon both predictable and unforgiving, because a runner who starts too fast has no hill to hide behind.

Pacing therefore decides the race. In a big field on the wide Slovenska cesta the temptation to run the opening kilometres too quickly is strong, and you pay for it over the final five kilometres, where the whole task is simply holding pace.

In training, threshold work is the foundation: tempo runs and longer threshold intervals around your target half-marathon pace. Add progressive long runs in which you run the closing kilometres faster to build the specific endurance for the second half of the race. Because the course is flat and forces almost no changes of pace, you benefit especially from sessions on flat, fast ground that groove an even race pace. Practise holding your goal pace steadily over long distances; on this profile the win goes not to the strongest surge but to the most even distribution of effort.