Corey Twine

I said I would return to this paper, and here we are again. Langford and colleagues (2026) have produced an outstanding position statement with implications extending well beyond strength and conditioning. The more I examine it, the more I appreciate its emphasis on what professional expertise actually requires. Beyond the eight qualification levels, five interconnected themes particularly stand out to me.

Explanatory Knowledge: Knowing what works is not equivalent to understanding why it works, under what conditions, or for whom. Professional decisions must be grounded in an understanding of underlying mechanisms.
Scientific Reasoning: Evidence informs decisions but does not automatically dictate practice. Practitioners must evaluate causation, uncertainty, competing explanations, and the relevance of research to the individual problem.
Practical Judgment: Expertise includes knowledge developed through experience, observation, and repeated problem-solving. However, intuition and confidence must remain open to examination, not treated as substitutes for evidence.
Error Detection and Correction: Advanced practitioners do more than recognize mistakes after they occur. They anticipate problems, question assumptions, evaluate outcomes, and proactively revise decisions when explanations fail.
Systems and Professional Responsibility: Expertise eventually extends beyond individual interventions to interdisciplinary coordination, organizational decision-making, mentorship, and the development of professional standards.

Perhaps the most important message is that professional expertise is not defined by how confidently someone delivers an intervention, but by the quality of their reasoning, the accountability behind their decisions, and their ability to recognize and correct errors. This is where our profession must continue to mature. We need fewer conversations centered exclusively on methods and more focused on the knowledge, judgment, and decision-making processes that justify their application. These distinctions matter not only for protecting professional credibility, but ultimately for the people whose performance and well-being we are responsible for.

Langford et al. (2026). International Journal of Strength and Conditioning.
doi.org/10.47206/ijsc.…

HUMAN PERFORMANCE: WHY INTEGRATION?

Human performance does not recognize organizational charts, professional titles, or the boundaries we create between disciplines. The human does not experience physiology, psychology, physical preparation, nutrition, medical care, recovery, and environmental demands independently. They experience them simultaneously, often under conditions where the consequences of inadequate preparation are significant. We can be exceptional within our individual disciplines and still fail to prepare the human for the demands that matter most. Excellence in isolation does not guarantee excellence in performance.

Integration is not about making everyone responsible for everything. It is about recognizing that specialized expertise must contribute to a shared outcome. This requires leadership that values depth of knowledge, respects professional boundaries, challenges disciplinary silos, and holds the collective system accountable. The ultimate measure of success is not the sophistication of our assessments, the complexity of our interventions, or the credentials of those delivering them. It is whether our combined efforts improve human capacity, manage risk, sustain readiness, and enable performance in the environment where it actually matters.

Different disciplines. Distinct expertise. Shared responsibility. Ultimately, we all stop at the human.

Burns and Collins (2023) describe the value of practitioners "possessing depth in one discipline but breadth across other facets" (p. 8). Breadth lets us collaborate; it does not give us license to lead another discipline's work. Rehabilitation uses exercise heavily, and that shared tool can create the impression that one discipline can cover the whole path from injury to performance.

The boundary only holds in one direction. No program would let a strength coach perform diagnostic ultrasound or direct a post-surgical protocol, because licensure prevents it, and rightly so. Physical preparation has no such protection, but the lack of a legal barrier is not evidence of competence. Responsibility should follow demonstrated expertise, not access to the athlete.

When it doesn't, the risks include exercise chosen for tolerance and enjoyment over need, and success measured by satisfaction rather than change in physical qualities and athlete state. The review shows how rehab and strength and conditioning prescriptions can contradict or duplicate each other when roles are unclear.

"Integration is an active process" (p. 11). Leaders must define roles, require every contribution to state its intended outcome and how it will be measured, and expect practitioners to hand off when a need exceeds their expertise. Recognizing that limit is expected professional behavior, not a concession. Demonstrated competence and the athlete's needs should determine responsibility. Burns & Collins, 2023.

Putting talented people under the same roof doesn’t automatically make them a team. Sometimes it just creates competing philosophies wearing the same logo.

I’ve always viewed a strong human performance team as branches of the same tree. Different expertise, experiences, and perspectives, but connected by shared principles and standards. Over my years in collegiate athletics and tactical human performance, I’ve worked under several directors, each with their own leadership style and training philosophy. Did I always agree with their decisions or scientific rationale? Absolutely not. But I understood my responsibility as part of that team. Challenge ideas internally, contribute where you can, and once a direction is established, communicate a consistent message to the athletes. Why? Because athletes see everything, especially when the professionals supporting them aren’t on the same page.

One place this alignment gets tested is individualization. Athletes understandably want some control over their training, but what they prefer isn’t always what’s best for them. That’s part of why we’re hired, to bring expertise and context they may not have when making those decisions. The problem starts when practitioners confuse accommodating preferences with meaningful individualization, especially when it makes them the favorite. There’s a difference between earning athlete buy-in and buying athlete loyalty by abandoning shared standards. Once athletes realize they can shop around for the answer they want, the practitioners maintaining those standards become the bad guys, and the entire program loses credibility.

A strong team doesn’t require everyone to think alike or use identical methods. It requires enough professional humility to recognize that your personal philosophy isn’t bigger than the collective mission. Disagreement should strengthen the team’s approach, not create competing versions of it.

Different branches, same tree. Otherwise, we’re just individuals working in the same building.

WHEN SCIENCE LOSES CONTEXT, PERFORMANCE GETS MISUNDERSTOOD.

As a practitioner, I’ve always been frustrated when human performance research becomes so consumed by standardization, statistical relationships, and the perfect scientific argument that it loses operational context.

Scientific rigor matters. So does understanding what we’re actually measuring.

As performance becomes more complex, more variables influence the outcome. Physical qualities interact with skill, coordination, decision-making, equipment, and environment.

Consequently, an isolated physical quality may explain little statistical variance without becoming less important to performance.

The NFL Combine is a perfect example.

Cook et al. (2020) analyzed 1,537 Combine participants. Three physical assessments explained approximately 2.6% of the variance in average snaps played during their first NFL season.

But consider the context. These were already high-level athletes, and playing time depends on opportunity, coaching decisions, injuries, and numerous other factors.

I saw this firsthand recruiting wide receivers. Someone would get excited: “This kid runs track!” We’d ask, “Great. Can he run routes, get open, and catch the football?”

Speed matters. But speed alone doesn’t make a football player.

That’s why teams also evaluate position-specific drills and game film. Each assessment answers a different question.

Human performance needs the same structure:

Tier 1 — Physical Qualities: What capacities exist?

Tier 2 — Functional Assessments: How are those capacities expressed during relevant tasks?

Tier 3 — Operational Performance: Can the individual meet actual job demands under representative conditions?

Without this framework, we risk mistaking limited statistical prediction for limited operational importance.

The answer isn’t abandoning standardization or predictive research. It’s interpreting findings within the appropriate context.

A physical quality can explain little variance and still represent an essential operational requirement. Every physical task imposes demands relative to available capacity. Greater relevant capacity can reduce that relative demand, providing more reserve for subsequent efforts.

The assessment isn’t necessarily wrong. The context in which we interpret it may be.

Reference: Cook et al. (2020). Journal of Strength and Conditioning Research.

#HumanPerformance #StrengthAndConditioning #OperationalReadiness