Exercise
VO2max intervals (4×4 minutes)
One hard interval session a week is the shortest route to raising VO2max — which falls ~10% per decade after 50 unless you push back.
Impact 4/54/5· RCTs / large cohortsEffort: a habit
First step today
On your next walk: 4× 1 minute fast, 2 minutes slow.
How
Warm up 10 minutes, then 4× 4 minutes at a pace you can barely sustain, with 3 minutes easy recovery. Once a week, alongside zone 2, not instead of it.
Evidence
Generation 100 (n=1,567, aged 70–77, 5 years): the high-intensity group had 37% lower mortality than controls (not significant, but clearly directional) and larger VO2max gains.
Goals
Healthy yearsHeart, blood sugarEnergy, fatigue
Related studies
Last reviewed: 6 September 2026
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