The numbers are hard to ignore. In 2025, 21% of Dutch workers reported experiencing mental fatigue on a monthly basis. A decade earlier, that figure was 13%. That's a 62% increase, documented in a major study published November 9, 2026 by CBS and TNO, the Netherlands' leading statistical and applied research institutions. And while the data originates in the Netherlands, the pattern it reveals is not Dutch. It's global.
What makes this research particularly significant isn't the headline number. It's who is driving it.
The Demographic Split That Changes Everything
Women and workers aged 25 to 34 are bearing the heaviest load. The CBS and TNO study links elevated exhaustion rates in these groups directly to job complexity, not simply the volume of tasks on their plates. This distinction matters. It shifts the conversation away from "people are just working too many hours" toward something more structural: certain workers are navigating cognitively demanding, emotionally loaded roles without adequate recovery infrastructure.
Complex jobs, by definition, require sustained decision-making, stakeholder management, ambiguity tolerance, and frequent context-switching. When those demands aren't matched by equivalent support, autonomy, or recovery time, fatigue accumulates. For women in this age bracket, who are statistically more likely to hold roles that blend high cognitive load with interpersonal labor, the compounding effect is significant.
This isn't a productivity complaint. It's a structural warning signal.
U.S. Data Confirms the Same Pattern
The Dutch findings don't stand alone. Research published in January 2026 by Great Place To Work and Johns Hopkins arrives at a nearly identical conclusion for the American workforce. Young employees and individual contributors, those without direct reports or formal leadership titles, are experiencing the steepest declines in well-being. At the same time, well-being among senior leadership is actually improving.
That gap is worth sitting with. Executives and senior managers are reporting better mental health outcomes than their teams. The workers doing the most complex, day-to-day execution, often with the least organizational power, are the ones burning out at higher rates. If your wellness strategy doesn't account for that inversion, it's not reaching the people who need it most.
For a broader look at what's driving these patterns across organizational structures, Burnout in 2026: Root Causes and What Actually Works breaks down the systemic factors behind rising burnout and which interventions are showing measurable results.
The Wellness Gap: Benefits That Miss Their Target
Here's the uncomfortable truth for HR leaders: most corporate wellness programs are built around access, not targeting. A gym membership subsidy, a meditation app license, an annual wellness stipend. These benefits look comprehensive on a benefits page. But they're functionally generic, and generic doesn't move the needle for the workers most at risk.
A 2026 employer benefits analysis from Movember, the global men's health organization, found that physical activity programs embedded in benefits packages measurably reduce anxiety, improve sleep quality, and strengthen workplace connection. The evidence base is solid. The problem is distribution. These programs remain underfunded and underdesigned for mid-level and junior staff, precisely the demographic the CBS/TNO and Great Place To Work data identify as highest risk.
Senior employees often have more flexibility to use wellness resources during the workday. They have more autonomy over their schedules. Junior and mid-level workers, particularly those in complex roles, frequently don't. So the people with the most access to recovery time use the benefits, and the people who most need recovery time don't. The result is a wellness gap that widens over time rather than closing.
The issue of remote and hybrid work adds another layer. Isolation compounds cognitive fatigue, and distributed teams don't benefit from informal social recovery the way in-office workers once did. Remote Work's Mental Health Toll: What the Data Shows details how physical and social disconnection is feeding the burnout pipeline in ways that benefits packages haven't caught up with.
Why Physical Activity Is the Under-Leveraged Tool
Exercise isn't just a physical health intervention. The physiological mechanisms connecting movement to mental resilience are well documented. Regular physical activity reduces cortisol reactivity, improves sleep architecture, and supports the kind of sustained cognitive function that complex jobs demand.
One of the more compelling pieces of recent science involves irisin, a hormone released during exercise that appears to influence metabolism, mood regulation, and neurological function. How Exercise Rewires Your Metabolism Through One Hormone explains why consistent movement produces benefits that extend well beyond calorie burn or cardiovascular fitness. For workers under sustained cognitive load, these systemic effects matter.
For women specifically, the case for structured physical activity as a burnout buffer is particularly strong. Resistance training, in particular, has been shown to improve mood, reduce anxiety symptoms, and support hormonal regulation. Is Strength Training the Key to Women's Longevity? examines the growing body of evidence linking regular resistance work to long-term mental and physical health outcomes in women, the demographic the CBS/TNO research identifies as most at risk from rising work exhaustion.
But there's a caveat that wellness program designers often miss. It's not enough to encourage physical activity in isolation. Research is clear that a 45-minute workout doesn't neutralize eight hours of uninterrupted sitting. The structure of the workday matters as much as what happens before or after it. Your Workout Doesn't Cancel Out Sitting All Day outlines why sedentary work patterns remain a risk factor even for people who exercise regularly, and what movement integration during the workday actually requires.
What Targeted Programming Actually Looks Like
The strategic implication from both the Dutch and U.S. data is straightforward: segmented wellness programming outperforms one-size-fits-all approaches in both uptake and measurable outcome. Age-specific and gender-informed design isn't about offering different tiers of the same product. It's about understanding what workers in different life stages and role types actually need to recover, and building programs around those needs.
For workers aged 25 to 34 in complex roles, that tends to mean flexibility, structure, and social accountability. This age group often responds well to cohort-based fitness challenges, access to qualified personal training, and wellness formats that fit into constrained schedules rather than requiring a lifestyle overhaul. When companies invest in professional fitness guidance at the junior and mid-level, they're addressing the access gap directly.
If your organization is exploring coaching or training partnerships as part of a benefits refresh, the quality of guidance matters significantly. Credentials vary widely in the fitness industry, and for HR teams building programs at scale, understanding what qualifications actually signal competence is worth the time.
Sleep is another underweighted lever. The Movember 2026 analysis found improved sleep among workers participating in structured physical activity programs. That's not incidental. Poor sleep and mental fatigue are tightly linked, and the CBS/TNO data reflects exhaustion that accumulates precisely when workers don't have adequate recovery between cognitively demanding days. Wellness programs that treat sleep as a secondary outcome rather than a primary target are leaving significant impact on the table.
The Strategic Case for HR Leaders
If you're responsible for benefits design, workforce well-being, or people strategy, the 2026 research landscape is giving you a clear directive. The workers most at risk aren't the ones with the most visible stress. They're the ones in the middle of organizations, running complex projects, navigating ambiguous responsibilities, often without the status or schedule flexibility that makes wellness resources accessible.
Generic benefits packages won't fix this. Neither will adding one more app to a digital wellness portal. What the data supports is targeted investment: physical activity programs built for the schedules and needs of junior and mid-level staff, gender-informed design that acknowledges the specific pressures women face in complex roles, and organizational structures that treat recovery as a performance input rather than a personal responsibility.
The 62% rise in work exhaustion over a decade is not a gradual drift you can address with incremental tweaks. It's a structural problem that requires a structural response. The demographic data tells you exactly where to start.