The PHILLIPS FIT Principles

Six principles that define how PHILLIPS FIT thinks

The PHILLIPS FIT Method™ is built on six guiding Principles that shape how every training decision is made.

Rather than treating the programme as the authority, PHILLIPS FIT keeps you as the primary reference point — considering your goals, biomechanics, current nervous-system capacity and response to each demand to help determine what happens next.

WHY — The 6 Principles define why PHILLIPS FIT makes training decisions the way it does.

WHAT — The 11 Decision Points™ define what PHILLIPS FIT considers when making those decisions.

HOW — The PHILLIPS FIT Method™ brings them together through Assess → Match → Expand to determine how we decide what happens next.

1. Never assume capacity. Assess it!

What somebody was capable of last week, or even earlier in the same session, does not automatically tell us what their nervous system can successfully handle and tolerate right now.

Capacity can vary with sleep, stress, recovery, previous training, illness, sensory demands and other influences.

It may also be constrained by the prediction the nervous system is currently operating from, meaning the body can possess the physical potential to do more while the nervous system is not currently allowing full access to that potential.

PHILLIPS FIT therefore starts by gathering information rather than assuming that today's capacity matches yesterday's.

Assessment establishes the starting point for the decision.

2. Right intervention. Right level of demand. Right time. Right person.

An exercise is not appropriate simply because it is considered a "good exercise".

Its suitability depends on who is performing it, what it asks of them, how much of that demand is applied and how their nervous system responds to it at that moment.

• Sometimes the correct decision is to continue the training as planned.

• Sometimes it is to change the exercise, load, range, volume, breathing strategy, sensory demand or another variable.

• Sometimes assessment may indicate that exercise itself is not currently the most appropriate intervention.

• And sometimes the most appropriate decision is to leave a particular compensation alone for now.

Not every compensation needs to be immediately "corrected".

Sometimes it is the nervous system's best solution for keeping the movement organised around a current capacity limitation.

Under load, that matters. If a compensation is helping you manage the weight, coaching it away can suddenly reduce your ability to produce force and control the load — potentially turning a well-intentioned technique correction into a serious safety issue.

That's why PHILLIPS FIT doesn't automatically try to make every movement look more "textbook".

Movement that looks better is not automatically movement your nervous system can handle better.

The aim is not to intervene simply because something can be changed.

It is to determine what is most appropriate for you, right now.

3. The response informs the decision.

Completing an exercise does not automatically mean the exercise was well tolerated.

Traditional training largely judges an exercise by its externally visible performance: Was the rep completed? Did the technique look right? Did it consciously feel okay?

Those things matter, but they do not tell us everything.

An exercise can look technically correct and consciously feel completely fine while assessment reveals an unfavourable nervous-system response that would otherwise go unnoticed.

The PHILLIPS FIT Method™ therefore also considers what is happening at this less visible (non-conscious) level: did your nervous system successfully handle and tolerate the demand?

If the response remains organised, training may continue.

If a defensive response occurs, the training decision must change — whether that means modifying the demand, changing the exercise or considering a different intervention.

Feedback is not something gathered after the session. It helps shape the programme in real time as it happens.

4. Fit the training to the person — not the person to the training.

A programme is a plan.

It is not an obligation.

Traditional programming can sometimes encourage the person to fit the prescribed exercise, load, repetition target or progression because that is what has been written down.

PHILLIPS FIT takes the opposite approach.

The programme provides direction, but the individual determines how that programme is applied.

Exercise selection, dose, progression and other variables can therefore be adapted to the person's goals, biomechanics and current nervous system capacity.

The person does not have to prove themselves worthy of the programme. The programme has to remain appropriate for the person.

5. Progression must be demonstrated, not presumed.

Traditional measures of progression largely reflect externally visible performance: more weight, more repetitions, greater range of motion or a more complex exercise.

Those measures matter, but they tell us that you managed to do more, not necessarily that your nervous system successfully handled and tolerated more.

Within the PHILLIPS FIT Method™, a progression can be introduced and the response to that increased demand then reassessed at a non-conscious nervous-system level.

If your nervous system continues to successfully organise and tolerate the new demand, the progression may be retained.

If a defensive response occurs, that information guides whether the progression should be modified, reduced or reversed.

Progression is not defined solely by what you were able to complete. It is also defined by how successfully your nervous system handled the increased demand.

6. Expand capacity using the most appropriate strategy.

Expansion does not simply mean "do more".

It means determining what needs to change in order for you to successfully access and tolerate greater levels of movement, force, load, complexity or other forms of demand.

Sometimes the limitation is physical capacity, in which case appropriately progressed exercise may be exactly what is needed to build greater strength, fitness or tissue capacity.

At other times, the body may already possess the physical potential to do more, while the nervous system's current prediction is limiting access to that potential.

In those situations, simply applying more exercise may not address what is actually limiting capacity, and a different intervention — such as Neuro Reset Technique (NRT) — may be more appropriate.

Expansion is not about applying more demand. It is about identifying what is limiting capacity, then choosing the most appropriate strategy for increasing what you can successfully access and tolerate.

How the Principles Fit the Method

The PHILLIPS FIT Method™ brings three elements together:

The Principles govern how PHILLIPS FIT thinks.

The 11 Decision Points™ determine what information PHILLIPS FIT considers.

Assess → Match → Expand determines how that information becomes action.

Together, they create a training process in which decisions remain responsive to the individual rather than being dictated by the programme alone.

Never assume capacity. Assess it!
Train to your capacity. Expand what's possible.