A training programme that stays unchanged for weeks eventually stops working. That is neither a motivation problem nor a sign of a poor programme, but simply physiology: constant stimuli eventually stop producing the hoped-for adaptations, because the training stimuli have to be adapted to the progress made. Training theory calls the answer to this progressive overload. In practice it is usually reduced to a single action – more weight. Yet the training theory taught at the update Akademie knows four adjusting screws, and weight comes last in the recommended order.
Progression is a principle, not a technique
The general training principles describe the conditions under which training works at all. They are not laws that stand on their own; they influence one another and should be seen as a connected network. Progressive overload is one of them – and it is particularly closely tied to two neighbours.
The first is the principle of optimal training stimuli. Stimuli below the stimulus threshold achieve nothing, while excessive stimuli can damage the musculoskeletal system and other organ systems. The stimulus threshold is the point at which the physiological system first triggers an adaptation process, and it always depends on the structure the stimulus acts upon. Take Bert, who climbs three floors on foot every day instead of taking the lift: for the leg muscles the fatigue may well be enough, while for the cardiovascular system the stimulus stays below threshold. The same action is progressive for one structure and ineffective for the other.
The second neighbour is the principle of individuality. The better the training status, the stronger the stimuli needed for further progress. In beginners, the smallest stimuli are often enough to bring about adaptations. And as the level rises, the stimuli have to be applied ever more specifically, whereas in the untrained it is general progress that comes first. So anyone asking “how much should I increase” is asking the wrong question: there is no universally valid recommendation for stimulus intensity, because it depends on the training goal.
The four adjusting screws in the recommended order
An increase in load can be achieved in various ways. There is a clear order, one you work through from top to bottom in the coaching conversation before reaching for the next screw.
1. Increase training frequency
An example: three sessions per week instead of two. As a parameter, training frequency is simply the number of sessions completed per week – and therefore the screw with the greatest leverage in beginners. A client who completes a solid full-body programme twice a week will as a rule gain more from a third session than from five more kilos on the leg press. The additional stimulus here does not come from a higher load but from the higher frequency with which the system is addressed at all. At the same time, this screw pays directly into the principle of continuity: securing training progress means training regularly and without interruptions, because interruptions fairly soon result in a plateau or even a regression.
2. Increase training density
An example: shorter rests between exercises. As a parameter of training control, this variable is called stimulus density and describes the time relationship between load and recovery within a training session. In the fitness centre this is the screw that is most often overlooked – and the one that costs the least. The same programme with the same weights, but with noticeably shorter rests between machines, is objectively a different session. For guests with a tight time budget it is often the only viable way up.
3. Increase training volume
An example: 30 minutes of cycling instead of 20. Training volume covers all the stimuli acting on the body during a training session – a distance covered when jogging, for instance, or repetitions and sets in strength training. In the strength area, this screw therefore means: one more set, one more exercise for the target muscles, one more round in the circuit. It works reliably but lengthens the session – which is why it comes after density in the order.
4. Increase training intensity
An example: 25 kg of added weight instead of 20 kg. This is exactly where most people reach first – skipping three adjusting screws in the process. Training intensity describes the stimulus strength, the physical power produced, the subjective effort and the quality of training. So it is not identical to the number on the plate: cleaner execution, a more controlled movement speed or a higher degree of exhaustion all raise intensity without adding a single gram. Depending on the type of training, it is measured differently: in strength training it is mainly the physical weight and the speed that count, in endurance training usually heart rate, speed or the rating of perceived exertion.
Why the order is not arbitrary
One reason lies in the different adaptation times. Functional adaptations – such as optimised activation of the skeletal muscles or accelerated metabolic processes – happen relatively quickly. Structural adaptations, that is, the gain, loss or remodelling of biological mass, take longer. The active musculoskeletal system also recovers faster than the passive one. Anyone who turns the intensity screw first under heavy loads is loading tendons, ligaments, cartilage and bones before these structures have caught up. Hence the rule: under heavy loads, always keep an eye on joints and bones before increasing.
The second reason is recovery. Adaptation effects largely take place during the recovery phase after a successfully completed session – which makes recovery at least as important as the load itself. Every increase shifts this relationship. Psychological, mental and emotional components play a part in this: positive experiences can have a favourable effect on the recovery process, while a stressful environment disrupts it. Anyone who wants to know more about shaping the recovery phase will find this thought continued in the article on the importance of recovery in training.
How to make the increase measurable
The parameters of training control serve not only for planning but also for comparison: they allow the load of one session to be quantified and compared with other sessions or training phases. Conversely, training load can be planned and controlled by defining these parameters. Alongside training frequency, stimulus density, training volume and stimulus intensity, this also includes stimulus duration – the period over which training takes place – as well as the total load of a training session.
Accumulated training stimuli are difficult to measure and often have to be captured through the rating of perceived exertion. One proven method is the Foster scale: half an hour after the session, the athlete rates the total load from 1 (very low) to 10 (hardest training). Competitions can be rated in the same way. For progression this value is more useful than it looks – it shows whether an increase on paper actually arrives as an increase. In order to shape recovery optimally, determining the total load is explicitly important.
Variation is not the same as progression
A widespread short circuit: when progress stalls, the training programme is swapped. Varying the training load is indeed a training principle in its own right – stimuli of the same kind can lose their effect over time depending on the goal, and monotonous training is considered unfavourable for the mind and for motivation. But a change of programme does not replace an increase.
Three examples show this. Switching from the guided chest press to bench pressing with the barbell is a variation of the material training means, yet muscularly only a small change – a resistance is still being pushed away straight ahead at shoulder level. Conversely, switching from the shoulder press machine to the lateral raise machine is not a variation of the training means, yet muscularly a substantial change, because the resistance is now lifted purely through a movement of the shoulder muscle. Only the switch from barbell deadlifts to the leg curl machine changes both. So anyone who varies should know what they are varying – otherwise the programme looks new and physiologically is not.
Progression within the network of the other principles
Two further principles reach directly into the increase. The optimal sequence of loading governs the order within the session: coordinatively demanding content such as speed, technique and coordination training requires a rested organism and therefore comes at the beginning, followed by strength or muscle training, with endurance training last. For ambitious athletes it is also an advantage to train only one factor of performance capacity per session, since the effect of strength training is decisively reduced by endurance training performed afterwards.
And finally, progression needs a period over which it is planned – the principle of periodisation and cycling. This includes status assessments, which make progress measurable and thereby create the optimal conditions for progressive overload in the first place. How to translate these steps into a concrete plan is shown in the article Creating a training programme: from the goal to the training week in six steps.
Course tip from update Akademie: The training principles and the parameters of training control are foundational material – anyone who has a firm grasp of them plans progression instead of guessing at it. In the Fitness- und Bewegungstrainer Basic course you build exactly this foundation and learn to derive increases in load cleanly for different target groups. Anyone who only wants to go deeper into this one topic will find it in concentrated form in the workshop Die optimale Gestaltung von Trainingseinheiten.
Frequently asked questions about progressive overload
Do I have to apply the four adjusting screws in this order?
Training theory generally recommends the order training frequency, training density, training volume, training intensity. It is a guideline for the standard case and not a rigid law, since the training principles influence one another. If a client cannot increase her training days for work reasons, you simply start with density. What matters is that you choose deliberately instead of reaching reflexively for the weight.
Why is my training no longer working despite more weight?
Several causes are possible. Often only one adjusting screw was used while frequency, density and volume stayed unchanged. Just as often recovery is missing, since adaptation effects largely take place in the recovery phase after the session. And finally, structural adaptations take longer than functional ones, so visible progress arrives with a delay.
What is the difference between stimulus density and stimulus duration?
Stimulus density is the time relationship between load and recovery within a training session, that is, essentially how the rests are arranged. Stimulus duration, by contrast, describes the period over which training takes place. Two sessions can therefore last equally long and still have completely different stimulus densities.
How do I recognise whether a stimulus was above threshold at all?
A stimulus has to reach a minimum magnitude for the physiological system to trigger an adaptation process. This stimulus threshold always depends on the structure the stimulus acts upon – the same load can be above threshold for the muscles and below threshold for the cardiovascular system. In practice, a documented status assessment and the rating of perceived exertion after the session will help you further.
Does a new training programme replace the increase in load?
No. Variation and progression are two different training principles. A change of exercise can change very little muscularly if the direction of movement stays the same, and it can change a great deal even though the machine is the same. A new programme without increased parameters is therefore above all variety for the mind.
Conclusion
Progressive overload is the principle that turns regular training into actual progress – and it has four adjusting screws, not one. Anyone who knows the recommended order from frequency through density and volume to intensity has an answer for almost every situation in the fitness centre, even when time, resilience or the diary set tight limits. The parameters of training control turn a gut feeling into a verifiable figure. And because adaptations largely take place during recovery and passive structures catch up more slowly than active ones, every increase comes with the question of whether the body has already processed the last one.
