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What the evidence says · reviewed Nov 7, 2026

What we know, what we don't, and how we use it.

We summarize public research on workplace stress, breathing and yoga. Each article says how strong the evidence is and what we do with it at SERENA.

Survey dataGallup 2026 · WHO

Workplace stress in Mexico, in numbers

41%felt a lot of stress the previous day
29%are engaged at work
12 billionworking days lost each year worldwide to depression and anxiety

Gallup's annual workplace survey places Mexico close to the regional average for daily stress. The WHO estimates the global cost of depression and anxiety at work at nearly one trillion dollars in lost productivity per year.

How we use it: stress is measured in the moment, with a simple 1 to 5 question, before and after every pause.

Survey and market dataGartner 2026 · Global Wellness Institute

Why companies are asking for measurement

In August 2026, Gartner reported that fewer than 35% of employees have high wellbeing, and that wellbeing has not improved significantly in three years despite organizational investment. The Global Wellness Institute sizes the global workplace wellness market at 53.3 billion dollars in 2024, with near-zero growth over the last five years.

The takeaway is simple: budget stays with what shows results.

How we use it: every event delivers the group's average change from arrival to exit, anonymous and aggregated.

High evidenceMeta-analysis · 223 studies

Slow breathing: what we know

A review of 223 studies found that slow, guided breathing is associated with an increase in vagally mediated heart rate variability, during practice, right after it and across multiple sessions. That marker is used as a signal of recovery and stress regulation.

How we use it: SERENA's base pause is inhaling for 4 seconds and exhaling for 6, guided by a circle on your screen or on the big screen.

Moderate to low evidenceMeta-analysis of clinical trials

Yoga, stress and sleep

A meta-analysis of 30 trials found that yoga helps with stress and anxiety, with low-level evidence. Another, of 19 trials with 1,832 women with sleep problems, found moderate improvements in sleep quality. In young athletes, a 30-day trial showed improvements in stress and mindfulness.

That's why we talk about helping manage stress, not treating any condition.

How we use it: the Recovery and Sleep programs coming to Practice build on these practices, and are measured like any other pause.

Promising evidence, low qualityReviews of randomized trials

Yoga at school: what we know

21randomized trials with students aged 5 to 16, reviewed in 2023
Mostof those that measured stress or anxiety reported a reduction
0trials at low risk of bias; larger studies are needed

A review of 21 trials found encouraging results of yoga at school on stress, anxiety and self-esteem, but the studies are small, very different from each other, and almost all rely on what students report themselves. An earlier review of 9 trials found improvements in mood, tension and self-esteem, and concluded the evidence is still inconclusive.

That's why we present it as a break that helps children calm down and focus, not as a treatment.

How we use it: short, age-appropriate, in-person sessions, with the school's authorization. We don't record any data from children; measurement, if the school asks, is only with teachers and adult staff.

PrivacyLFPDPPP 2025

How we protect your data

Mexico's personal data law, reformed in March 2025, treats health status as sensitive data. That's why event surveys don't ask for name, email or phone, and the company only sees averages for groups of 5 or more.

How we use it: anonymous by design, always aggregated, with a privacy notice on every QR.

How we choose and review sources

We use public sources anyone can check: peer-reviewed studies, bodies like the WHO and INEGI, and releases from firms such as Gartner and Gallup. We state the level of evidence for each topic and don't use figures we couldn't find in their original source.

  1. We research and cite every figure.
  2. We check nothing promises health outcomes.
  3. Cristina Díaz reviews the practice content.
  4. We update the review date with every change.

This content is informational and doesn't replace a consultation with a health professional.

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