Why training zones need a clear definition
Training zones are used by every coach—but they are not defined the same way.
The same terms are often used across different systems, but they represent different meanings and criteria.
As a result, coaches frequently mix definitions from different paradigms—sometimes within the same program—without realizing that each system operates by its own internal logic.
This hidden mismatch is one of the main reasons why training decisions become inconsistent and results are difficult to reproduce.
What coaches really need to define is:
- how effort is applied
- how training load is structured
- what adaptation is expected
You may not know that, but while the terminology is shared between training paradigm, the definition of zones and their boundaries – are not.
This is happening because different training systems use different criteria to define zone boundaries.
As a result:
👉 the same name for the “zone” may represent very different effort type, set duration, and, more importantly, the training effect itself depends on the system used.
Selecting imprecisely defined or mixed zone systems within the same program is one of the main reasons why training results are often inconsistent and unpredictable.
Unlike other training paradigms, 3S is using a simple universal criterion for Zone definition that changes how all training process elements can be interconnected:
👉 A training zone can be defined by the maximum duration for which a specific energy system can sustain critical work output.
This definition provides a direct and consistent way to structure training.
How Zones are defined under “traditional” training paradigms
Practically all current training systems’ Zones are are based on physiological markers, such as:
- blood lactate concentration
- heart rate
- maximum oxygen consumption
This is understandable, since these markers describe how the human body responds to exercise in its current preparedness state.
However, this approach can not directly define:
- how long standard effort can be sustained (critical power output on all range of competitive effort durations)
- how training loads should be structured (recommended optimum exercise format in relation to each zone)
- how to connect training sets with training goals (lacking ability to offer dynamic change of “form” throughout the season)
As a result:
- zone boundaries depend on testing methods (A. Mader, H. Heck)
- the same athlete may receive different zone definitions under different test protocols
- training intensity becomes a fixed reference rather than a temporal functional parameter
- 👉 Important Notes for Lactate Based Zones:
– The Lactate Threshold values depends on testing protocols and results interpretation
– To truly understand lactate responses, testing should be conducted daily. Do you have environment, resources, and experience to carry this “study”?
The 3S / ETC approach. What 3S is Going Differently?
The Ergometric Training Concept (ETC), implemented in 3S, is also grounded in physiology—but uses a different zone defining method.
Instead of using physiological responses as primary criteria, 3S defines training zones through time of effort/power output at critical intensity:
👉 3S Zones are based on the time-based capacity of each energy pathway, thus directly connecting zone boundaries with time they can work at critical power level. Physiological markets are used to check the boundaries, but not as a primary criteria.
Where 3S Stands in relation to other paradigms
👉 A training zone can be defined by the maximum duration for which a specific energy system can sustain critical work output.
What this Means for Real Life Coaching
3S approach allows to connect all critical training elements, while making it very easy and practical to apply in daily routines of every coach:
- time (duration of effort)
- intensity (power / speed)
- distance (performance output)
- physiological response (as supporting indicators)
👉 All elements of training under 3S framework are expressed through TIME.
Why time is truly unifying criterion
In sport:
- performance is measured in time
- effort is applied over time
- adaptation occurs over time
Physiological energy systems also operate within time limits:
- each system has a maximum duration at which it can sustain high output
- these durations define natural boundaries between zones
👉 Therefore:
👉 time provides a direct and universal way to define training zones and further connect zones with all other elements of the training process.
Practical meaning for coaching
3S approach using time as main criterion – removes any guessing from your training decisions
Once training zones are defined through time and connected to precise power output levels:
- training targets become precise and effective
- effort can be assigned based on duration at specific level of intensity
- training sets can be matched to zone training requirements by most effective modality
This creates a direct link between:
👉 Training goals → Training Loads (“how much?”) → Training Sets (“How Fast”) → Predefined Outcomes!
From definition to application
Using this approach:
- zones determine the effective duration of work
- training sets are selected to match that duration
- intensity (pace) is adjusted based on current ability
This allows the coach to:
- design training more precisely
- maintain consistency across sessions and seasons
- evaluate performance progression objectively
Connection to physiology
The 3S approach does not ignore physiology.
It uses the same energy systems—but defines them differently:
👉 not through lactate concentration
👉 but through their time-based work capacity
Physiological markers (lactate, heart rate, VO₂) can still be used:
- as control parameters
- as validation tools
👉 but not as the primary defining criterion
Why this matters
When zones are defined through unstable or indirect criteria:
- training targets become inconsistent
- training sets may not produce the intended effect
- long-term planning becomes difficult
When zones are defined through time-based capacity:
👉 the system becomes:
- stable
- consistent
- directly connected to performance
Final takeaway
Training zones are not just labels.
They are the foundation of the training process.
👉 In traditional systems, zones describe physiological response.
👉 In 3S, zones define how training is structured and applied.
👉
Zones are not estimated—they are defined.
Next Step
If this framework makes sense, the next step is understanding how to apply it in practice:
- How to Define Training Zones Properly
- How to Design a Training Season
- How to Distribute Training Load Within a Week
