New research offers a surprising message for those struggling to fit fitness into their routines: it’s not necessarily how frequently enough you exercise, but how much total activity you achieve. A study published this week in the Journal of the American Heart Association found that even just one or two days of vigorous exercise can yield comparable health benefits to more frequent workouts, challenging long-held beliefs about optimal exercise schedules. The findings, based on analysis of data from over 93,000 individuals in the UK, offer encouraging news for individuals with busy lifestyles and coudl reshape public health recommendations.
Even a small amount of vigorous exercise – just one or two days a week – can deliver comparable health benefits and longevity to those who work out more frequently. This finding challenges conventional wisdom about the need for daily physical activity and offers encouraging news for individuals with busy lifestyles. A new study published in the Journal of the American Heart Association reveals that achieving 150 minutes of moderate-to-vigorous physical activity weekly is key, regardless of how it’s scheduled.
“You don’t need to exercise every day to stay healthy,” says Zhi-Hao Li, lead author of the study and an epidemiologist at the Southern Medical University School of Public Health in Guangzhou, China. “As long as you complete 150 minutes of moderate-to-vigorous physical activity per week – whether it’s in one or two days, or spread out – you can significantly reduce your risk of dying from cardiovascular disease, cancer, or other causes.”
Current recommendations from both the World Health Organization (WHO) and the American Heart Association advise adults to engage in 150 to 300 minutes of moderate-intensity aerobic physical activity, or 75 to 150 minutes of vigorous-intensity aerobic physical activity each week, or an equivalent combination of both.
Researchers are increasingly referring to the practice of exercising only a few days a week as the “weekend warrior” approach – a term coined by Harvard epidemiologists I Min Lee and Ralph Paffenbarger. This pattern is gaining popularity as individuals seek to fit fitness into busy schedules.
In the new study, researchers analyzed health and physical activity data from more than 93,000 people within a large biomedical database in the United Kingdom. They aimed to understand how different patterns of physical activity might affect the risk of death from all causes, specifically cardiovascular disease and cancer. Activity levels were tracked using wrist-worn accelerometers, devices that measure movement and are considered more accurate than self-reported activity.
Participants were categorized into three groups:
The results showed that, compared to the inactive group, both “weekend warriors” and those who were consistently active experienced a significantly lower risk of death from cardiovascular disease and cancer when they completed 150 minutes of physical activity per week. This finding suggests that it’s not necessarily *how* you fit in your exercise, but *that* you reach the recommended weekly target.
Further analysis revealed that, among weekend warriors:
Among regularly active participants:
There were no significant differences in the risk of death between weekend warriors and the regularly active group.
Some of the findings surprised the research team, who initially anticipated that spreading physical activity throughout the week would be more beneficial. They hadn’t predicted that the concentrated activity of weekend warriors would reduce the risk of death.
“This message is encouraging for busy people who struggle to incorporate daily exercise, but manage to fit in a concentrated burst of activity on weekends or over a few days,” Li said. “The research provides reassuring evidence that even sporadic physical activity can have lasting health benefits, making it easier for people to prioritize their well-being amidst busy schedules.”
While the study aligns with previous research, it is the first to analyze the relationship between activity patterns measured by accelerometers and the risk of death from cardiovascular disease and cancer. This objective measurement method strengthens the study’s conclusions.
According to Keith Diaz, a cardiologist with the American Heart Association, the findings emphasize that the total volume of physical activity is the crucial factor for health benefits, rather than how it’s distributed throughout the week.
“Many people find it difficult to exercise daily during the workweek; however, this research shows that even if you can only exercise on weekends, you can still obtain significant health benefits,” Diaz noted, adding that he was not involved in the new study but serves on the Association’s Physical Activity Science Committee.
However, he cautioned that attempting to condense 150 minutes of exercise into one or two days could potentially overload the body.
“Some research suggests that weekend warriors have a slightly higher risk of musculoskeletal injuries compared to those who exercise more regularly. However, the benefits of exercising only on weekends far outweigh the potential risks. If you’re going to be a weekend warrior, be sure to warm up properly and gradually increase activity volumes over time. That will help reduce your risk of injury,” Diaz recommended.
The study had several limitations, including the fact that physical activity was measured only at the beginning of the study period. Additionally, participants resided in the United Kingdom and were predominantly white, meaning the results may not be generalizable to other populations. Further studies are needed to confirm these findings in more diverse groups and to consider additional factors, such as genetic predisposition or environmental exposures, that may influence physical activity and outcomes.
