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.
The plan, week by week
Minutes per week. Tap a week.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. This plan is built for runners looking to race faster: the structure, pacing guidelines, and weekly progression are calibrated to your specific situation, not a generic template.
Goal-pace long runs for an intermediate half marathon
For a faster half marathon, the session that matters most late in the block is goal-pace running inside the long run. Start with something like 2 × 10 minutes at half marathon pace in the middle of an easy long run, then build over the weeks to around 8 to 10 km at that pace. This is how you find out whether your goal is realistic. If the pace feels manageable and your form holds, you are on track. If you are hanging on after 20 minutes, adjust the target now rather than on race day. A recent 10K result is a useful guide to what your half marathon pace should be.
Weekly mileage for an intermediate half marathon
Most intermediate runners aiming for a half marathon personal best do well on roughly 35 to 55 km a week, spread over four or five runs, with the long run building to around 18 to 22 km. You can go a little past race distance in training, but for this race there is not much benefit in long runs beyond about two hours. Consistency is more useful: several steady weeks in a row beat one big week followed by a tired one. If you want more mileage, add it as an extra easy run or a few minutes on existing easy runs. Keep the long run to roughly a quarter or a third of your weekly total.
Moving from finishing to racing
The difference between a finisher and a racer is threshold development. At intermediate level, you have enough base to introduce sustained tempo running — that comfortably hard effort where you can speak three words at a time but not hold a conversation. One quality session per week at this intensity, combined with consistent easy volume, is the fastest route to a meaningful time improvement.
The plateau most intermediate runners hit
Intermediate runners often plateau because they're running moderate intensity most days — hard enough to accumulate fatigue, but not hard enough to drive real aerobic adaptation. The fix is polarising your training: make easy days genuinely easy (you should feel slightly guilty about how slow you're going) and make hard days genuinely hard. The middle intensity zone is where fitness goes to stagnate.
Pacing discipline on race day
The biggest race-day mistake at intermediate level is going out too fast. Adrenaline and fresh legs make the first kilometre feel easy at a pace you can't sustain. Empirically, starting 10–15 seconds per kilometre slower than target pace and holding back through the first half results in faster finish times than going out at goal pace and fading. This plan includes race-pace long run segments to build the discipline.
Training philosophy
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.
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 — with Daash, Claude can restructure it 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?
Daash sees missed sessions in your Garmin data. Tell Claude why — illness, fatigue, life — and it reworks the coming week: redistributing sessions, reducing volume if needed, or adjusting the next quality session, then updates the workouts on your watch.
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.