Completing a half marathon is a major personal achievement. Whether you are preparing for your first race, returning to running after time away, or aiming to improve your previous time, the right training plan can help you build confidence, endurance and resilience.
A half marathon challenges you as both a runner and an athlete. Good preparation is not just about running more miles. It should include easy runs, longer endurance runs, strength work, recovery, mobility, and — for those chasing a faster time — structured speed sessions.
At M20 Health & Performance in Manchester, we support runners across West Didsbury, Altrincham and the North West with running coaching, injury rehabilitation, strength and conditioning, movement screening, performance testing and race preparation.
For most beginner runners, 12 to 16 weeks is a realistic timeframe to prepare for a half marathon.
The right length of plan depends on your starting point, current fitness, injury history and goal. If you already run regularly, 12 weeks may be enough. If you are newer to running, returning from injury, or building from a lower base, a 16-week plan may be more appropriate.
Most half marathon runners fall into one of three groups:
The guide below is designed as a simple 12-week beginner half marathon training plan. For runners who need a longer build-up, each phase can be extended before progressing to the next stage.
A good half marathon plan should include more than running. Strength work, mobility, cross-training and rest days all help your body adapt to training.
Core and leg strength exercises are especially useful for runners because they help improve control, posture, running efficiency and resilience. This could include Pilates, single-leg exercises, glute work, calf strengthening, squats, lunges and functional resistance movements.
Recovery is just as important as the running itself. You cannot adapt properly if you are not recovering between sessions. Regular rest days, mobility work, stretching and correct use of a foam roller can all support your training.
Muscular tightness, persistent soreness, poor sleep, reduced motivation or unusually heavy legs can all be signs that your body is not fully recovering.
The first four weeks are about building consistency. The aim is to get used to running regularly without overloading your body too soon.
Focus on easy running, controlled effort and developing a routine. Walk breaks are fine, especially during the longer run. The goal is to finish feeling like you could have done a little more.
In weeks 5 to 8, the plan introduces progression running. This helps you practise changing pace while still keeping the session controlled.
You will also start building your long run towards 60–80 minutes. This is where endurance develops, but the pace should still feel manageable. Do not race your long runs.
The final phase helps you build towards longer efforts and more sustained running. The aim is to prepare your body and mind for the demands of race day.
Your longest run may reach 90 minutes to 2 hours depending on your fitness, goal and recovery. The final hour should be steady and controlled, not a full race effort.
If your goal is to improve your time or achieve a personal best, your training needs to become more specific.
That means using structured sessions, clear intensity targets, recovery guidance and race-specific preparation. It also means understanding your body’s strengths and limitations before simply adding more mileage.
At M20 Health & Performance, our coaching approach is built around sport science, clinical experience and real-world performance planning. We can help you establish your goal, review your training history and assess your current physical qualities through musculoskeletal screening.
From there, we can create a bespoke training plan using TrainingPeaks™, with clear session targets, intensity zones and progression built around your race date.
Running injuries often happen when training load increases faster than the body can adapt.
Common issues for half marathon runners include calf pain, Achilles tendinopathy, knee pain, hip pain, shin pain, plantar fascia pain and general overload from doing too much too soon.
A good plan should include:
For runners in Manchester and the North West, we can also support your training with movement screening, physiotherapy, shockwave therapy where appropriate, gait analysis, VO2 max testing, blood lactate analysis and personalised coaching.
Running a half marathon is a huge achievement, but the right plan can make the process safer, smarter and more enjoyable.
Whether you are training for your first half marathon or aiming to improve your time, our team can help you build a clear plan, reduce injury risk and prepare properly for race day.
Ready to take the next step? Book an appointment online and start your half marathon training with support from qualified sports practitioners in Manchester and the North West.
