A half-marathon training plan, from first race to PR
Whether this is your first 13.1 miles or your tenth PR attempt, the plan starts from where you are now, not a table built for "the average runner".
Most half-marathon plans you find online start from a goal time and hand everyone between that range the same paces. That doesn't work if you're new to structured training, and it doesn't work if you've been running for months and you're already faster than the plan assumes. TERUN reads your own running data and builds paces around your fitness, for the whole build to race day.
Running your first half marathon
The question most beginners have isn't "what pace" — it's "how much is enough". How many weeks do you need, how do you build the long run without getting hurt, and when should you back off? TERUN tracks your accumulated fatigue and schedules cutback weeks automatically when your load climbs too fast, instead of handing you a fixed plan that has no idea how the last few weeks actually felt.
From history to plan in four steps
Connect
Link your account. Your recent activities load automatically.
Estimate
It reads steady segments, fits pace vs. heart rate and predicts your half-marathon time.
Set the goal
Pick half marathon and a date; it periodizes base → build → peak → taper over a 10-to-14-week block.
Adapt
Every week it re-paces and reconciles against what you actually ran.
Why paces built for you matter over 10 to 14 weeks
In a half-marathon block your fitness jumps, especially coming off a shorter block. A fixed plan bakes in day-one assumptions — your easy runs drift too hard, or your tempo runs feel too easy. Because TERUN's paces float on your measured fitness, easy stays easy and your quality paces stay accurate, all the way to the start line.
Cross-training counts too. Cycling and swimming give a small, conservative boost to your estimate, and strength work is folded in as a recovery constraint, so your plan reflects your whole training week, not just the runs.
Coming from the 10K, or stepping back from the marathon?
Building up from the 10K? Start with the 10K training plan. Aiming further, at the full distance? The marathon training plan works the same way, just over a longer block.