What Is Periodisation in Training? Planning the Year, Not the Session
By the BrainSnail editorial team. How these articles are written and checked, and how to tell us when one is wrong.
An athlete who trained at maximum effort every day would be injured within a month and would arrive at the competition tired. Periodisation is the answer to that problem: dividing the training year into blocks, each with a different purpose and a different balance of volume and intensity, arranged so that fitness peaks when it matters and the body gets the recovery it needs to adapt. It was worked out by Soviet coaches in the 1960s and is now the backbone of almost every serious training plan.
Why the body needs a plan
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.
Macro, meso and micro
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
The phases of a season
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.
Linear, undulating and block
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.
For someone with a job
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.
The takeaway
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.