Coaching 5 min
Periodisation explained: base, build, peak and taper
Periodisation is a structured approach to training that divides your race preparation into four distinct phases—base, build, peak and taper—each with a specific purpose. This framework prevents burnout, builds fitness progressively and times your peak performance for race day. Understanding how to move through these phases is essential for any runner aiming to race well.
What is periodisation and why does it matter?
Periodisation is a training framework that organises your preparation into phases, each designed to develop a particular aspect of fitness while managing fatigue and injury risk. Rather than training the same way every week, you deliberately shift focus—building aerobic capacity first, then introducing speed, then sharpening race-specific fitness, before backing off to recover. This prevents plateaus and the mental and physical staleness that comes from monotonous training.
The base phase: building your aerobic foundation
The base phase is typically the longest, lasting 8–12 weeks or more. Your focus here is aerobic development: running most miles at an easy, conversational pace to build your aerobic engine and strengthen connective tissues. Speed work is minimal or absent. This phase develops the fitness ceiling you'll work towards later.
- Mostly easy-paced running (conversational effort)
- One longer, steady run per week
- Strength and mobility work to prepare for harder training
- Gradual mileage increase of no more than 10% per week
- Low injury risk if progression is controlled
The build phase: adding speed and race-specific work
Once your aerobic base is solid, typically 6–8 weeks before race day, you enter the build phase. Here you introduce tempo runs, interval sessions and race-pace efforts. Your weekly mileage may stabilise while intensity increases. This is where you develop the speed and lactate threshold that translates to race performance.
- One tempo or threshold run per week (20–40 minutes at comfortably hard pace)
- One interval or VO2 max session (repeats at 5K–10K pace)
- One long run, often at an easier pace
- Recovery runs fill in the rest of the week
- Fatigue increases; listen to your body
The peak phase: racing hard and sharpening fitness
The peak phase typically lasts 2–4 weeks and comes 2–3 weeks before your target race. Here you perform your fastest efforts and may run shorter, race-pace repeats. The goal is to feel sharp and confident, not necessarily to accumulate high mileage. This is when you test race tactics and confirm you can handle race-day effort.
- Shorter, faster repeats at or faster than goal race pace
- Reduced overall volume compared to the build phase
- One or two tune-up races to practise pacing and execution
- Higher intensity but lower cumulative fatigue
- Mental preparation and race-day rehearsal
The taper: recovering before race day
The taper is the final 7–14 days before your race. You reduce mileage by 40–60% while maintaining some short, sharp efforts to keep your neuromuscular sharpness. This gives your body time to fully recover while staying race-ready. Many runners feel fresher and faster at the end of a good taper.
- Reduce mileage significantly; quality over quantity
- Keep a few short, fast repeats to maintain sharpness
- Increase sleep and manage stress
- Stay off your feet as much as possible outside of running
- Trust your training; resist the urge to 'get fit' in the final week
How to adapt periodisation to your race distance
A 5K race demands a shorter, sharper build and peak phase, with more emphasis on VO2 max and anaerobic work. A marathon requires a longer base phase, sustained tempo work and a build phase centred on long-run progression. A half-marathon sits somewhere in between. Adjust the length and intensity of each phase to match your goal race distance and your own recovery capacity.
Periodisation and data-driven training
Periodisation works best when informed by real data about your fitness, fatigue and readiness. By tracking heart-rate variability, resting heart rate, pace on easy runs and how you feel during key sessions, you can make smart adjustments within each phase. If you're under-recovered, you extend the base or ease back in the peak. If you're progressing faster than expected, you might accelerate into the build phase. RunV-style coaching integrates periodisation with live feedback, so your training adapts to your individual response, not just a static plan.
FAQ
- How long should each phase last?
- Base typically lasts 8–12 weeks, build 6–8 weeks, peak 2–4 weeks and taper 1–2 weeks. Total training cycles often run 16–20 weeks. Adjust based on your race distance, current fitness and how much time you have before your goal race.
- Can I skip the base phase if I'm already fit?
- No. Even experienced runners need a base phase to rebuild work capacity, strengthen tendons and ligaments and establish a fitness ceiling for the training that follows. Skipping it increases injury risk and limits your peak performance. Experienced runners may compress the base phase slightly, but never skip it entirely.
- What if I miss a workout during a phase?
- One missed session rarely derails a phase. If you miss multiple sessions due to illness or injury, extend that phase by a week or two rather than trying to 'catch up' with extra intensity. Consistency over time matters far more than any single week of training.
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