The back is not fragile. It is undertrained.

The back is the most claimed body part in Canada. It is also the one employers are most frightened of loading. Those 2 facts are related, and not in the direction most people assume.

The fragility story, and where it came from

Somewhere in the last forty years the workplace absorbed a model of the spine as a delicate structure that damage accumulates in irreversibly. You can hear it in the language: don't twist, protect your back, save your back. The implication is a finite resource being spent.

That model produces a specific and expensive behaviour. A worker reports back pain, and the response is to reduce load - lighter duties, less lifting, more rest. Which feels protective, and for the first days after an acute injury often is. Held for weeks, it does something else: it deconditions the exact tissue that needed to get stronger, while confirming to the worker that their back is a liability.

What persistent back pain looks like

The second thing worth separating is acute injury from the far more common presentation, which is not an injury at all.

Repetitive strain is widespread, work-attributed, and mostly does not arrive as an incident. Nobody dropped anything. There is no moment to report. The worker simply gets worse over months, works through it, and eventually either adapts or becomes a claim.

The presenteeism figure is the one that should worry an employer more than the claim count. Most of this is happening on shift, in people who are at work, producing less than they could, and generating no paperwork at all until the day they do.

Load is the treatment, not the hazard

The clinical position - and this one is genuinely ours, so read it as an argument rather than a citation - is that a back that hurts under load usually needs more load, applied progressively, not less.

That is not a licence to load an acutely injured spine. It is a statement about the 12 weeks after the acute phase, which is where the expensive decisions get made. The choice in those 12 weeks is between building the tolerance the job demands and waiting for pain to resolve on its own. The second is what mostly happens, and it is why claims that should close in 6 weeks run to 60.

Why this needs measurement rather than confidence

Everything above is an argument, and arguments are cheap. The reason we can act on it rather than just publish it is that capacity is measurable.

An isometric trunk extension test gives a number. Benchmarked against age and sex norms, that number says whether this person's spine is currently under-built for their own job. 12 weeks of progressive loading, retest, and the number has either moved or it has not - which is the only way to tell a program that works from a program that everyone felt good about.

That is what Bulletproof Back is, and what capacity measurement produces.