How To Prepare For A Half Marathon

This guide explains how to approach how to prepare for a half marathon, including the preparation, practical steps, common mistakes, and final checks that help you finish with confidence.

10-16 weeks Time needed

Medium Difficulty

Overtraining & Injury Watch out for

Before You Start

Check first: Consult your GP or a medical professional before starting any new strenuous exercise programme, particularly if you have pre-existing health conditions or haven't exercised regularly. This helps ensure you're fit enough for the demands of training.

Step-by-Step Instructions

Quick Reference

Common Problems When You Prepare for a Half Marathon

Training for a half marathon isn't always smooth sailing. Understanding common challenges and how to tackle them can keep you on track.

Overtraining and Burnout

Pushing too hard without enough rest can lead to physical fatigue, lack of motivation, and even illness. Symptoms include constant tiredness, poor sleep, increased heart rate, and decreased performance. The fix? Prioritise rest days, listen to your body, and don't be afraid to take an unscheduled day off. Remember, missing one run is better than getting injured or completely burnt out.

Running Injuries

Common running injuries include runner's knee, shin splints, plantar fasciitis, and Achilles tendonitis. These often stem from increasing mileage too quickly, poor form, or inappropriate footwear. To prevent them, follow the 10% rule for mileage increases, replace your running shoes every 500-800 km, and include strength training for supporting muscles. If pain persists, seek advice from a doctor or physiotherapist promptly.

Poor Nutrition or Hydration

Not fuelling properly can leave you feeling sluggish, tired, and unable to perform during runs. Symptoms include hitting "the wall" frequently, low energy, and poor recovery. Ensure a balanced diet with enough carbohydrates, protein, and healthy fats. Carry water or electrolytes on longer runs and sip water throughout the day. Dehydration can severely impact performance and health.

Hitting the Wall

This is when your body runs out of available glycogen (stored energy), usually around 10-18 miles in a marathon, but can happen in a half if you're under-fuelled. You'll feel sudden fatigue, heavy legs, and a strong urge to stop. The solution is to practice your mid-run fuelling strategy (gels, chews, sports drinks) during training and ensure adequate carbohydrate intake in the days leading up to the race.

Lack of Motivation

Long training plans can feel repetitive. It's normal to lose motivation sometimes. Try varying your routes, running with a friend or a running club, listening to new music or podcasts, or signing up for another, shorter race in the middle of your training plan to break things up. Remind yourself of your initial goal and visualise crossing that finish line.

Advanced Tips for How To Prepare For A Half Marathon

Once you've mastered the basics, these tips can help you optimise your training and race day performance.

Incorporate Hill Training

Running hills builds strength, speed, and mental toughness. Find a moderate hill (5-10% gradient) and run repeats: sprint up, jog down. Or, include rolling hills in your longer runs. This makes flat races feel easier and prepares you for any elevation changes on your race course.

Tempo Runs and Speed Work

Beyond easy runs, add structured speed work. Tempo runs (running at a comfortably hard pace for 20-40 minutes) improve your lactate threshold, allowing you to run faster for longer. Interval training (short, fast bursts with recovery periods) boosts speed and efficiency. These should be incorporated gradually and carefully to avoid injury.

Mental Preparation

The half marathon is as much a mental challenge as it is physical. Practice visualisation: imagine yourself running strong, overcoming difficulties, and crossing the finish line. Develop a mantra or positive affirmation to repeat when runs get tough. Break the race down into smaller, manageable segments (e.g., "just get to the next mile marker").

Post-Run Recovery Protocols

Beyond simple rest, consider specific recovery protocols. An ice bath or cold shower can reduce inflammation. Compression socks can aid blood flow and reduce muscle soreness. Prioritise consuming a carbohydrate and protein-rich snack or meal within 30-60 minutes of finishing a long or hard run to kickstart muscle repair and glycogen replenishment.

Course Reconnaissance

If possible, drive or cycle the actual race course a few weeks before the event. Pay attention to hills, sharp turns, water stations, and potential challenging sections. This knowledge helps you plan your race strategy more effectively and avoids surprises on race day.