Moving from 10K to half marathon distance is less about doubling one run overnight and more about extending endurance gradually. This eight-week bridge is designed for runners already completing three runs per week, including a relaxed 8–10 km outing, without concerning symptoms.

Before progressing from 10K to half marathon

Use effort rather than an exact pace. Easy running should allow conversation in full sentences; the steady portions should feel controlled, never like a race. If your recent training has been interrupted by illness, injury or a long break, rebuild shorter distances first.

The weekly structure

Each week contains three runs: one easy run, one session with a modest steady component and one long easy run. Add one or two rest days after the long run or steady session. Optional strength or mobility work should support the plan, not compete with it.

Eight-week progression

  • Week 1: easy 5 km; 6 km with 3 × 4 minutes steady and 2 minutes easy; long run 10 km.
  • Week 2: easy 5–6 km; 7 km with 2 × 8 minutes steady and 3 minutes easy; long run 11 km.
  • Week 3: easy 6 km; 7 km including 20 minutes steady; long run 12 km.
  • Week 4—down week: easy 5 km; relaxed 6 km with four short controlled pickups; long run 10 km.
  • Week 5: easy 6 km; 8 km with 3 × 7 minutes steady and 2 minutes easy; long run 13 km.
  • Week 6: easy 6–7 km; 8 km including 25 minutes steady; long run 15 km.
  • Week 7: easy 6 km; 7 km with 2 × 10 minutes steady; long run 17 km at comfortable effort.
  • Week 8—consolidate: easy 5 km; relaxed 5–6 km with four short pickups; long run or event 18–21.1 km only when healthy, prepared and appropriately supported.

Adjust the plan intelligently

The distances are guides, not debts. Repeat a week when the long run causes unusual fatigue, shorten by 10–20 per cent during stressful periods, and skip the steady work when recovery is poor. Do not add missed kilometres to the next session. RunHQ’s rescheduling guide offers a practical framework for interrupted weeks.

Fuel and hydration practice

Longer outings are an opportunity to practise the breakfast, fluids and any carbohydrate strategy you intend to use on event day. Test one change at a time in training. The RunHQ long-run breakfast guide provides a starting point, while individual needs may require advice from an accredited sports dietitian.

Strength and recovery

One or two brief strength sessions may include calf raises, split squats, hinges and trunk work. Keep the heaviest session away from the long run and reduce volume during weeks six to eight if soreness lingers. Sleep, ordinary meals and easy days are part of the progression.

Event-week choices

If week eight ends with an organised half marathon, check the event’s hydration, medical and cut-off arrangements. Start conservatively and treat completion as the goal unless longer-distance training and recent results support a faster plan. Hot or humid weather may require slower pacing and adjusted hydration.

Conclusion

The bridge from 10K to half-marathon distance should feel patient. Extend the long run in small steps, include a lighter week, protect recovery and practise the routines you will use on event day. A repeatable build is more valuable than one heroic session.

Sources and image credit

Health and safety notice: This article provides general information only and is not personalised medical, training, nutrition or exercise advice. New or returning runners, and anyone who is pregnant, taking medication or living with a health condition, should consult an appropriately qualified health or exercise professional before starting or changing training. Seek individual nutrition advice where appropriate. Stop exercising and seek appropriate help if you experience concerning symptoms such as chest pain, faintness, unusual shortness of breath, severe or sharp pain, weakness, numbness, fever or symptoms that persist or worsen.

Related reading: Lake Macquarie Running Festival 2026 Results: Morgan and Wilson Top the Half Marathon.