"How did that feel?"
It is a useful question.
But it is not the same question as:
"What did we measure?"
Athlete feedback provides information that a sensor cannot.
Measurement provides information that perception alone cannot.
I AM 900 keeps those sources distinct and then looks at them together.
What subjective assessment tells us
An athlete can describe effort, confidence, discomfort, stability, fatigue and how a movement felt to perform.
Those experiences matter because the athlete is the person performing the task.
Subjective information provides context.
It should not automatically be converted into an objective physical measurement.
What objective measurement tells us
Measurement records defined physical variables.
Depending on the instrumentation and task, these can include pressure, distribution, angle, timing, sequence, repeatability, loading and movement response.
The measurement describes what the instrument recorded under those conditions.
It does not independently explain the complete reason the response occurred.
When feeling and measurement disagree
This can be particularly informative.
An athlete may report that a movement feels easier while the recorded response changes very little.
Alternatively, the measurement may change while the athlete reports little subjective difference.
Neither automatically invalidates the other.
They are answering different questions.
The difference itself may provide useful information for the next test.
Why baseline matters
Without a baseline, both subjective and objective comparisons become weaker.
Establish what the athlete reports.
Establish what can be measured.
Change the input.
Repeat the task.
Then compare both sources again.
This creates a clearer picture than assuming that either perception or measurement tells the entire story.
Measurement is context, not a verdict
I AM 900 uses measurement to improve the quality of the question.
It is not a score of whether an athlete is "good" or "bad".
It is not a diagnosis.
It is a record of the physical response under defined conditions.
Combined with the athlete's own report and the context of the task, that record becomes more useful.
Why Retesting Both Matters
The same logic applies on the second test.
Repeating the task and comparing both sources — the recorded measurement and the athlete's report — shows what changed on each side.
WHAT THE ATHLETE REPORTS MATTERS.
WHAT THE MEASUREMENT RECORDS MATTERS.
THEY ARE DIFFERENT SOURCES OF INFORMATION.
A change in one without a change in the other is not a failure of the test — it is a finding that shapes the next question.
That comparison is the subject of Retest in Sports Performance.
Ask the athlete.
Measure the response.
Keep the information distinct.
Then compare what changed.
