An hour of lifting a week may be the longevity sweet spot

Everyone agrees exercise is good for the heart and for lifespan, but the harder questions remain open: how much, how hard, and what kind? Guidance tends to treat more activity as straightforwardly better, yet it has never been clear whether that holds at the extremes, or whether some types of training buy more years than others. This review set out to pull together what the recent literature actually says about duration, intensity, fitness and specific sports, and how each relates to long-term cardiovascular health and life expectancy.

The authors conducted a systematic review of studies published between 2011 and 2022, searching PubMed for research on fitness, exercise dose and exercise type in relation to cardiovascular health and life expectancy. Studies were included if they addressed those topics directly. The evidence base they drew on was largely epidemiological, meaning big populations followed over time, alongside a large pooled analysis of strength training and mortality. They then synthesised the findings across intensity, volume and modality.

Cardiorespiratory fitness was inversely related to the risk of dying from any cause, with no increased mortality risk even in the fittest group, and being unfit ranked among the most potent risk factors for all-cause mortality. Both moderate and vigorous activity were associated with reduced cardiovascular and all-cause mortality, but paradoxically, high doses of moderate activity reduced mortality better than high doses of vigorous activity. A large pooled analysis linked strength training to lower rates of death and cardiovascular disease, with the best outcomes at a cumulative dose of about 60 minutes per week. Physical interactive play was strongly associated with improved life expectancy, while very large volumes of strenuous exercise or weightlifting may not be ideal.

This review confirms the core message of decades of research, that fitness is a key determinant of cardiovascular health and lifespan, while complicating the assumption that intensity and volume can be increased without limit. The finding that high doses of moderate activity outperformed high doses of vigorous activity, and that strength training benefits peaked at a modest weekly dose, pushes back on a more-is-better mindset. Because most of the underlying evidence is observational, it cannot settle cause and effect, and the ideal upper limits for keen athletes remain an open question.

If you train at all, this is reassuring reading: being fit was linked to lower mortality across the board, and being unfit was among the strongest risk factors identified. For anyone deciding how to spend limited training time, the pattern here is a reason to value consistent moderate activity, a regular but not enormous dose of strength work, and sports played with other people. It is also a reason not to assume that ever larger volumes of punishing exercise are buying extra years, since the review suggests they may not be.