One minute of vigorous activity may deliver similar health benefits to 4–9 minutes of moderate activity.
A 2025 new study published in Nature Communications analysed wearable data from over 73,000 adults in the UK Biobank and showed something that could change how we think about exercise intensity.
Here’s what they found:
One minute of vigorous activity may deliver similar health benefits to 4–9 minutes of moderate activity — and up to 50+ minutes of light activity for outcomes like heart disease risk, diabetes, and overall mortality. This is a change from the long-standing guideline (based on self-reported exercise) that assumed a simple 1:2 ratio between vigorous and moderate exercise. Current recommendations from the World Health Organization still reflect that older model. But wearable-based data now gives us a more precise picture of how intensity impacts health.
What this means in practical terms
Higher intensity work is extremely time-efficient. Short bursts of challenging effort can produce outsized health benefits compared to longer sessions at lower intensities. That doesn’t mean everyone should jump straight into all-out training but it does mean intensity, when applied safely and progressively, is a powerful tool.
Interestingly, the study also found that light activity alone provides much smaller protective effects. Moving more is always good but to meaningfully reduce chronic disease risk, we need some exposure to moderate and vigorous effort.
How we apply this at Salus Strength
At Salus Strength, this research aligns closely with how we already design training:
Efficient sessions: Only 30-minutes, twice a week, focused strength work that challenges muscles enough to create meaningful adaptation without wasting time.
Individualised intensity: We train every muscle to the point of momentary muscular failure. However we also scale intensity to your needs, meaning working at a level that is appropriately challenging for you.
Strength as health insurance: Resistance training isn’t just about aesthetics. It’s one of the most effective ways to improve metabolic health, bone density, and long-term function.
Smart progression: We prioritise good technique and gradual overload so you get the benefits of intensity without unnecessary injury risk.
For many of our clients who are busy adults balancing work and family this is encouraging news. You don’t need hours in the gym. Well-structured, purposeful training can deliver significant health returns in a relatively short time.