ＮＡＨＡマラソン takes place on Sun, Dec 6, 2026 in Naha, Japan. The main route is 42.2 km.
- Date
- Sun, Dec 6, 2026
- Start
- Naha 🇯🇵
- Distance
- 42.2 km
- Level
- Open to all
Your 9-week plan to ＮＡＨＡマラソン
The Build phase starts this week. Built around your fitness and adjusted every day as your form changes; attach the course and it prepares for the climbs too.
Build my planFree to start · No credit card
The NAHA Marathon is one of Japan's largest citizen marathons, held on a course through Naha City and five surrounding southern municipalities, including Peace Memorial Park.
What this race demands
ＮＡＨＡマラソン demands sustained pacing and aerobic endurance across a full 42.2 km marathon distance. Athletes must manage their energy expenditure carefully over the standard running format.
Aerobic endurance
The 42.2 km distance requires prolonged muscular and cardiovascular output over several hours of continuous running.
Pacing discipline
Completing a full marathon requires an even or negative split strategy to prevent premature fatigue in the later stages of the race.
A target intake of 30 to 60 grams of carbohydrates per hour is recommended to sustain energy levels throughout the duration of the marathon.
What would it take you?
Pick the level closest to yours for an estimate of finish time on this course and the training a solid preparation needs.
Estimated finish
3:45–4:30
Peak-week training
5–7 h/week
A model estimate from distance, climbing and level, not a promise. Conditions, drafting and pacing move it.
IntervalCoach turns those weekly hours into a concrete plan built around your actual fitness. Start with this race as your goal
Your road to race day
Race day at ＮＡＨＡマラソン is 9 weeks away. This is how a coach divides that time. The first phase starts now.
01Build3 weeks · Oct 5, 2026 – Oct 25, 2026
Progressive overload: training load climbs in waves, with harder weeks stacked on the base and planned recovery weeks that let the gains land.
02Peak3 weeks · Oct 26, 2026 – Nov 15, 2026
The hardest weeks of the plan: race-specific intensity at nearly full training load, sharpening exactly what this race asks for.
03Taper2 weeks · Nov 16, 2026 – Nov 29, 2026
Volume drops while intensity stays: short, sharp efforts keep the legs awake as fatigue drains away.
04Race week1 week · Nov 30, 2026 – Dec 6, 2026
Openers, rest and logistics. The work is done; the job now is arriving fresh.
Frequently asked questions
When is ＮＡＨＡマラソン?
ＮＡＨＡマラソン takes place on Sun, Dec 6, 2026 in Naha, Japan.
How long is ＮＡＨＡマラソン?
The main route is 42.2 km.
What does ＮＡＨＡマラソン demand?
ＮＡＨＡマラソン demands sustained pacing and aerobic endurance across a full 42.2 km marathon distance. Athletes must manage their energy expenditure carefully over the standard running format.
Who is ＮＡＨＡマラソン for?
ＮＡＨＡマラソン is open to all participants.
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