Start with consistency, not distanceThe temptation is to chase kilometres as soon as a half marathon enters the calendar. That's usually the wrong place to start. Endurance is built through regular running. A manageable routine that you can maintain week after week is more useful than one ambitious long run followed by several days of recovery. Give your body time to adjust before asking it to do more.The first question isn't, "How far can I run?" It is, "How consistently can I run?"Let your long run do the heavy liftingThe long run is central to half marathon preparation because it gradually makes time on your feet feel normal. You don't need to cover 21 kilometres every weekend. Instead, build your longest run gradually, allowing for easier weeks when needed. The objective is to become comfortable spending more time running, not to prove how far you can go every Sunday. A useful long run should leave you feeling that you could have continued a little further.Keep most runs comfortableNot every run needs to be fast. Easy running allows you to accumulate distance without turning every session into a hard effort. It also gives you room to focus on consistency and recovery while your endurance develops. There will be days when your pace feels slower than expected. That's fine. For half marathon preparation, completing the run comfortably can matter more than the number on your watch.Increase graduallyEndurance doesn't arrive in a single breakthrough. It accumulates. If your current distance feels manageable, add a little more rather than making a dramatic jump. Pay attention to how your body responds and give yourself easier days between demanding sessions. The calendar is an important part of the process. A half marathon is a long-term goal, and trying to compress the preparation rarely makes the journey easier.Know what you're building towardsA half marathon is 21 kilometres, but preparation isn't about reaching that number as quickly as possible. It's about arriving at race day knowing that you've spent enough time running longer distances, recovering properly and learning what your body can handle.Whether you're preparing for the 21K at the Times Internet Half Marathon or simply working towards your first long-distance race, endurance comes down to a fairly simple principle: run consistently, increase patiently and give your body time to adapt.The finish line is 21 kilometres away. The work that gets you there happens one ordinary run at a time.Test your endurance
Maximize your training: Proven strategies for enhancing endurance before your first half marathon run
Running 21 kilometres is less about speed than staying comfortable for longer. Building endurance takes time, consistency and a sensible progression in distance. For runners preparing for their first half marathon, the goal is to make longer efforts feel increasingly manageable without turning every run into a test.
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