Training Plan
12-Week Half Marathon Training Plan
A 12-week half marathon training plan designed for runners with a clear goal and a defined timeline. The half marathon rewards aerobic engine more than raw speed. The runners who struggle most are those who train like 5K runners, carrying too much intensity and not enough easy aerobic volume. Sustainable progression, quality long runs, and one threshold session per week is the formula that holds up across conditions.
The phases of a medium-length training block
A 12-week plan typically splits into three phases: base building (weeks 1–5), specific fitness development (weeks 6–9), and race preparation and taper (final 3 weeks). Understanding which phase you're in helps you interpret what the sessions are trying to accomplish.
Building progressive overload safely
Medium-length training blocks allow for proper periodisation: load builds over three weeks, drops on the fourth recovery week, then builds again from a higher baseline. Never skip recovery weeks — they're when adaptation happens. The recovery week feels like a step backward but delivers a step forward.
Race-week management
The final week before race day is about feeling fresh, not building fitness — that work is done. Keep sessions short, maintain intensity with one or two race-pace efforts of 60–90 seconds, stay off your feet more than usual, and sleep aggressively. The taper itch (restlessness, phantom soreness, doubt) is normal and almost always resolves on race morning.
Let Coach Baz build your personalised half marathon plan
This is the structure. Daash's AI coach, Coach Baz, personalises it around your schedule, current fitness, and goal — then adapts it week by week based on how training is actually going.
Get my personalised planSample training week
This is a representative week from the middle of the plan — not the first week (which starts lighter) or the peak week (which is harder). It gives you a sense of the session structure and weekly rhythm.
| Day | Session | Notes |
|---|---|---|
| Monday | Rest | Protect Sunday's long run investment |
| Tuesday | Easy run 40–50 min | Aerobic foundation work |
| Wednesday | Tempo run: 25–30 min at half marathon pace | Learn what race pace feels like |
| Thursday | Easy run 35–40 min | Keep it conversational |
| Friday | Rest or cross-training | Bike or swim — protect the legs |
| Saturday | Strides: 20 min easy + 6 × 20 sec strides | Sharpens leg turnover ahead of the long run |
| Sunday | Long run 90–100 min | The week's most important session — easy, patient pace |
Why use Daash for this training plan
A static plan — PDF, spreadsheet, or fixed programme — assumes your life runs on schedule. Coach Baz adapts week by week based on what you report: missed sessions, tired legs, travel, illness, or a breakthrough workout that means you can handle more. The result is training that fits the runner you actually are, not the one who never has bad days.
- Weekly plan adapts based on how your training actually went
- Garmin integration: structured workouts sent directly to your watch
- Conversational coaching — ask Coach Baz anything, any time
- No rigid race date required — set the goal, let the plan follow
Frequently asked questions
How many days per week does this half marathon plan require?
Most sessions in this plan run four to five days per week, including one quality session, a long run, and easy aerobic running. The plan is designed to be adjustable — Coach Baz can restructure around your available days each week.
Do I need a GPS watch to follow this half marathon training plan?
A GPS watch or running app is helpful for tracking pace and distance, but not strictly required. Effort-based running (using a scale of 1–10 perceived exertion) works well for easy runs. For quality sessions where specific paces matter, a watch becomes more valuable.
What should I eat before a long run?
For runs under 60–75 minutes, eating beforehand is optional. For longer runs, a light carbohydrate-based meal two to three hours before the session — oats, toast with banana, or a rice-based option — provides fuel without gastrointestinal issues. Avoid high-fat, high-fibre, or unfamiliar foods on long run mornings.
How does Daash adapt the plan if I miss a session?
Coach Baz adjusts your upcoming week based on what you report. If you missed a session due to illness, fatigue, or life events, log it in Daash and the next week's plan will reflect that reality — redistributing sessions, reducing volume if needed, or modifying the upcoming quality work to account for the missed training.
Do I need to take gels or nutrition during training for a half marathon?
For long runs over 75–80 minutes, practising race nutrition is valuable. Train with the gels, chews, or drinks available at your target race so your gut is adapted before race day. Do not try a new nutrition product for the first time on race morning.
Let Coach Baz build your personalised half marathon plan
This is the structure. Daash's AI coach, Coach Baz, personalises it around your schedule, current fitness, and goal — then adapts it week by week based on how training is actually going.
Start with Coach BazRelated training plans
- Half Marathon Training Plan for Beginners
Your first half marathon in 12 weeks. This beginner plan builds your long run progressively, keeps easy days truly easy, and gets you to 13.1 miles confident and uninjured.
- Half Marathon Training Plan for Intermediate Runners
Race your half marathon, not just finish it. Tempo runs, race-pace miles, and a structured taper to bring out a meaningful personal best at 13.1.
- Advanced Half Marathon Training Plan
A performance-focused half marathon block for experienced runners: high aerobic mileage, lactate threshold sessions, and race-specific long runs at goal pace.