Mobility and injury prevention

The trial literature on prevention grew up mostly in male cohorts, and the injury profile it described was not the one women’s football presents; anterior cruciate ligament injury in particular runs markedly higher in female athletes. A 2020 meta-analysis addressed the gap directly, pooling injury prevention programme trials across 11,773 female football players and reporting lower injury rates in the programme groups. Its value is that it converts an assumption about generalisability into a measured result in the population concerned.

Individual injury sites are harder to study than overall injury counts, because one site yields fewer events and underpowers the trials. The hamstring is the exception. A 2023 meta-analysis of randomised controlled trials on hamstring injury prevention and risk-factor management pools enough evidence to make site-specific statements, with eccentric-strengthening interventions carrying most of the signal.

Together the two reviews illustrate something about the shape of this evidence: it is a map of where trials have been run, not a map of the human body. Sports, populations and injury sites outside those cohorts are not contradicted by this literature. They are simply not covered by it.

The load literature advances a claim that is easy to state and hard to establish: how much work an athlete has been doing, and how fast that amount has been changing, is a risk factor in its own right — separate from the mechanism of any particular injury. A systematic review of the relationship between training load and injury, illness and soreness found relationships across all three outcomes, with both high absolute loads and rapid changes in load implicated.

The quality of that evidence is as much the story as the finding. The underlying studies are overwhelmingly observational, load is quantified in mutually incompatible ways across them — external measures such as distance and sprint volume, internal measures such as session ratings of perceived exertion — and injury definitions differ between cohorts. The review is explicit about that heterogeneity rather than smoothing it away.

The result is that load is established as a variable worth modelling and unestablished as a number worth targeting. The direction of the relationship holds. A line separating a safe workload from an unsafe one does not follow from it.

Stretching increases range of motion. That is the well-supported part, and the pooled evidence on the chronic effects of stretching confirms it. A 2025 systematic review and multivariate meta-regression went further, asking how the flexibility gain scales with the total amount of static stretching performed — the kind of question that requires a large body of trials and yields a curve rather than a verdict.

Past the headline the picture loosens considerably. The chronic-stretching synthesis tested which variables moderate the effect and found few that hold reliably. The field can state with confidence that stretching works, and with much less confidence what it is about stretching that does the work.

The finding that complicates everything is that stretching is not the only route to the outcome. A 2023 meta-analysis reports that resistance training through full range of motion produces range-of-motion improvements of its own. That result unsettles the usual justification for stretching as the dedicated path to flexibility.

Warm-up stretching is close to universal practice, and the reason usually given for it is injury prevention. The systematic review of the acute effects of muscle stretching in healthy active individuals — examining physical performance, range of motion and injury incidence together — does not support that rationale. It finds range of motion increases acutely, finds small performance decrements after prolonged static stretching immediately before maximal effort, and finds the injury-prevention case unsupported by the available evidence.

Two further reviews go at the other half of the assumption: that stretching is how range of motion is acquired. One compared strength training directly against stretching and found strength training at least comparable for improving range. The second, an independent meta-analysis, found that resistance training through full range produces range-of-motion improvements on its own. Three reviews, reached separately and asking different questions, converge against a belief held almost universally in practice.

Two limits matter. Unsupported is not disproved — the injury trials on stretching are few and underpowered, and absence of evidence at that density is a weak instrument. And the strength-versus-stretching comparison draws on a small literature. The papers cut against consensus practice; their weight is real, and it is not final.

Mobility in older adults is a different subject from mobility in sport, and a more consequential one. Roughly a quarter of adults aged sixty-five and over report a fall each year, and falls are the leading cause of injury-related death in that age group. The endpoint here is not performance; it is independence.

The 2024 JAMA review sets out how falls risk is assessed in community-dwelling older adults — gait and balance testing, medication review, orthostatic blood pressure, vision, cognition and home hazards — and what the intervention trials report. Exercise programmes incorporating balance and functional training carry the most consistent evidence, with pooled reductions in fall rate of roughly a quarter, and multifactorial assessment tied to targeted intervention is the approach the review describes.

This is clinical evidence, not a training brief. The research describes what has been assessed and what has been trialled in older populations. Decisions about an individual’s falls risk belong with their clinician.