A half marathon — 21.1 kilometres — is one of the most achievable and rewarding endurance goals for recreational runners. It demands genuine preparation, but unlike a full marathon, it's achievable in 12–16 weeks for most people with a reasonable base fitness. This guide covers everything a Sydney runner needs to successfully complete their first — or fastest — half marathon.
Step 1: Assess Your Starting Point
Before you start your half marathon training plan, be honest about your current fitness. As a rough guide:
- Beginner (0–15 km/week): Allow 16–20 weeks. Build your base before beginning a specific half marathon plan.
- Intermediate (15–30 km/week): A 12–14 week plan is appropriate.
- Experienced (30+ km/week): An 8–12 week performance-focused plan suits you.
The Four Pillars of Half Marathon Training
1. The Long Run
The weekly long run is the cornerstone of your half marathon preparation. It builds aerobic capacity, trains your body to burn fat efficiently and develops mental resilience. Key principles:
- Run long runs at a conversational pace — you should be able to speak in full sentences
- Increase distance by no more than 10% per week (the 10% rule)
- Peak long run: 18–19 km, typically 2–3 weeks before race day
- Taper for the final 2 weeks — reduce volume by 30–40%
2. Easy Runs
70–80% of your training should be easy running — slower than you think is "proper" running. Easy running builds your aerobic engine without accumulating the fatigue that leads to injury. If you finish easy runs feeling like you could have gone much further, you're doing it right.
3. Quality Sessions (One Per Week)
Once you have a solid base, add one quality session per week:
- Tempo runs: 20–40 minutes at "comfortably hard" pace (you can speak a few words but not hold a conversation)
- Interval training: Repeated efforts at 5km race pace with recovery jogs (e.g. 6 × 800m)
- Progression runs: Start easy, finish at half marathon goal pace
4. Strength and Cross-Training
Running-specific strength training is one of the most effective injury prevention strategies for half marathon runners. Prioritise:
- Single-leg strength: Bulgarian split squats, single-leg Romanian deadlifts, step-ups
- Calf and foot strength: Single-leg calf raises, toe curls, arch strengthening
- Hip strength: Glute bridges, clamshells, lateral band walks
- Core stability: Dead bugs, pallof press, Copenhagen plank
Sample 12-Week Half Marathon Plan (Intermediate)
| Week | Mon | Wed | Fri | Sun (Long) | Total |
|---|---|---|---|---|---|
| 1 | Easy 5km | Easy 6km | Strength | 10km | 21km |
| 4 | Easy 6km | Tempo 8km | Easy 6km | 14km | 34km |
| 8 | Easy 8km | Intervals | Easy 8km | 17km | 41km |
| 10 | Easy 8km | Tempo 10km | Easy 6km | 19km | 43km |
| 12 (race) | Easy 4km | Easy 4km | Rest | Race day | ~30km |
Injury Prevention for Half Marathon Runners
The most common reason runners don't reach their race — injury. Prevention strategies include:
- Don't increase mileage and intensity in the same week
- Replace running shoes every 600–800 km
- Run on varied surfaces — mix road, trail and grass
- Address any pain early — a sports chiropractor can identify biomechanical issues before they become injuries
- Prioritise sleep — muscle repair and adaptation happens during sleep, not training
- Fuel properly — don't run long distances in a fasted state once runs exceed 75 minutes
Race Day Tips
- Nothing new on race day — no new shoes, new food, new gear
- Start slower than feels right — it's far easier to speed up in the back half than to cling on after going out too fast
- Practise your nutrition strategy in training — use whatever gels or drinks the race provides on your long runs
- Dress for 5°C warmer than actual temperature — you'll warm up significantly once running
Sydney Half Marathons to Target
Sydney has excellent half marathon options throughout the year, including the Sydney Half Marathon, City2Surf (14km), Sydney Running Festival, Blackmores Running Festival and numerous local fun runs in the Hills District and Inner West.
Get Your Body Race-Ready
A pre-training chiropractic or exercise physiology assessment at Elevate Health Clinic identifies any biomechanical issues, muscle weaknesses or mobility limitations that could lead to injury during your half marathon build-up. Book an assessment at our Bella Vista or Earlwood clinics.
