What Is Periodisation in Training? Planning the Year, Not the Session

Training works by stress and recovery. A hard session damages muscle, depletes fuel and disturbs the nervous system; during the rest that follows, the body repairs the damage and overshoots, leaving itself slightly stronger than before. Do the next session at the right point and the gains stack; do it too soon and the body never catches up, which is overtraining, or too late and the gain fades.

The body also adapts to any one stimulus and then stops responding to it. A runner who does the same ten-kilometre run at the same pace every day improves for a few months and then plateaus. Progress requires changing the stress, and periodisation is a structured way of changing it.

The classical scheme has three nested layers. The macrocycle is the whole plan, usually a season or a year, ending at the main competition. It is divided into mesocycles of a few weeks each, and those into microcycles, usually a week, which are the unit an athlete actually thinks about. Each layer has a purpose:

• •Macrocycle: the year or season, aimed at one or two peaks
• •Mesocycle: a block of three to six weeks devoted to one quality, such as endurance or speed
• •Microcycle: a week, with hard and easy days arranged so that recovery is built in

A traditional plan for an endurance athlete or a team sport runs through three phases. The preparation phase, in the off-season, builds a base with high volume and low intensity: long easy runs, general strength work, technique. As competition approaches, volume drops and intensity rises in the specific phase, with sessions that mimic the demands of the event, intervals at race pace, heavier lifts. The competition phase keeps intensity high and volume low so the athlete arrives fresh, and the final week or two before the main event is a taper, in which training is cut sharply to let the accumulated fatigue clear while fitness remains.

After the season comes the transition phase, a few weeks of rest and unstructured activity, which is where much of the physical and mental recovery for the next year happens. Skipping it is the commonest mistake of the keen amateur.

Coaches argue about how to arrange the changes. Linear periodisation moves steadily from high volume and low intensity to the opposite over months, and suits sports with one clear season. Undulating periodisation varies volume and intensity from day to day or week to week, so that a lifter might do a heavy low-repetition session on Monday and a light high-repetition one on Wednesday all year round, which suits sports with long seasons and keeps the stimulus changing. Block periodisation concentrates on one quality at a time in short intense blocks, and is favoured for elite athletes who already have a broad base and need to sharpen specific abilities.

The research comparing them finds all three beat unplanned training and none clearly beats the others, which suggests that the principle matters more than the model: change the stress deliberately, and build in recovery.

A recreational runner training for a marathon in October can use the whole idea without a coach. Spend the spring and early summer building weekly distance slowly, at an easy pace, with one longer run each week. From about ten weeks out, hold the distance and add one faster session a week, intervals or a run at goal pace. Three weeks out, start cutting the mileage by a third and then by half while keeping a little speed. Take two weeks off afterwards before planning anything else. Within each week, follow a hard day with an easy one.

The same shape works for strength training, cycling, swimming and most team sports. The details differ; the pattern, build, sharpen, taper, rest, does not.

Many coaches plan with a simple model first proposed by the exercise scientist Eric Banister in the 1970s. It treats every training session as producing two effects at once: a gain in fitness and a load of fatigue. Your performance on any given day is roughly your fitness minus your fatigue. The key detail is that fatigue builds quickly and fades within days, while fitness builds slowly and fades over weeks. After a hard block, you may be fitter than ever but perform worse, because tiredness is masking the improvement.

This model explains why a taper works. If you cut training sharply for a week or two, fatigue drains away much faster than fitness does, and what is left is the improvement you have been hiding. It also explains the deload week many plans use, often one lighter week after every two or three harder ones: a small, regular chance for fatigue to fall before it becomes overtraining. The model is a simplification, but it gives you a useful way to read a bad week. Sometimes being slower in training is a sign that the work is going in, not that it is failing.

Planning blocks of harder and easier training is easier if you can measure how hard each week was, and a simple method used by many coaches is the session rating of perceived exertion, developed by the exercise scientist Carl Foster and colleagues. About half an hour after a session, rate how hard it felt as a whole on a scale from 0 for rest to 10 for maximal, then multiply by the minutes it lasted. A 50-minute easy run rated 3 scores 150, a 40-minute interval session rated 8 scores 320, and a 100-minute long run rated 5 scores 500.

Add the scores for the week and you have a single figure that can be compared across months, whatever mix of running, lifting or cycling went into it. A well-built plan shows the weekly total rising over a few weeks, dropping in a lighter week, and falling sharply in the taper. The most useful warning sign is a sudden jump well above what you have been doing over the previous month, which is associated with a higher risk of injury. The popular rule never to increase weekly distance by more than ten percent is a reasonable rough guide, but it has little direct research behind it.

Periodisation was formalised in the Soviet Union in the 1960s, when the sports scientist Lev Matveyev studied the training of Soviet athletes and described a structured annual plan, with a general preparation phase, a specific preparation phase, a competition phase and a transition phase of rest. Eastern European coaches built on his model, and their athletes' success at international competitions drew attention to it.

Western coaches adopted and adapted the approach in the following decades. Later researchers criticised the classic model as too rigid for sports with many competitions, which led to the block and undulating variations used today. The underlying idea, that training should be planned in cycles rather than repeated the same way every week, has become standard across professional and amateur sport.

Periodisation is the division of a training year into phases that trade volume for intensity as competition approaches, with recovery planned in at every level, so that an athlete adapts steadily and peaks on the day. Whether the plan is linear, undulating or in blocks matters less than having one.