New Study SHAKES Exercise Guidelines – Are You Doing Enough?

Scientists now say the real heart-protecting “sweet spot” for exercise may be closer to 10 hours a week than the comfy 150-minute guideline most people have been coasting on.

Story Snapshot

A large study links roughly 560–610 minutes of weekly activity to about a 30% drop in heart attack and stroke risk ^[1].
The familiar 150-minutes-a-week message still helps, but only trims cardiovascular risk by about 8–9% ^[1].
Other long-term research finds near-maximal longevity gains around 300–600 minutes moderate or 150–300 minutes vigorous exercise weekly ^[1]^[3].

The new “10-hour week” that shook up the comfort zone

A recent observational study published in the British Journal of Sports Medicine landed like a cold shower on the feel-good “just walk 30 minutes a day” narrative. Researchers followed adults and found that those who barely met the usual 150 minutes per week of moderate to vigorous activity shaved only about 8–9% off their cardiovascular risk ^[1]. To get what they called “substantial” protection—more than a 30% risk reduction—people needed about 560 to 610 minutes per week ^[1]. That is close to 10 hours.

Those numbers also came with a nuance that matters for anyone over 40: less-fit people had to work a bit longer than fitter peers to get the same protection, sometimes 30 to 50 extra minutes a week at the same intensity ^[1]. A deconditioned body cannot “hack” exercise efficiency the way a trained body can; the math of effort still has to be paid back in time and consistency.

How this fits with the famous 150-minute guideline

The American Heart Association calls 150 minutes per week of moderate-intensity aerobic activity or 75 minutes of vigorous activity the baseline adults should hit for health, with a nudge that 300 minutes or more yields additional benefits ^[5]. That guidance was always meant as a floor, not a ceiling. A large 30-year study of more than 116,000 people found that going two to four times above these minimums—about 300–599 minutes moderate or 150–299 minutes vigorous per week—was associated with roughly 35–42% lower mortality, including from cardiovascular disease ^[3].

Crucially, that study did not see harm from long-term high levels of vigorous exercise in otherwise healthy people ^[3]. It reported that “any combination of medium to high levels” of vigorous and moderate activity within those ranges provided nearly the maximum mortality reduction ^[3]. That is a powerful confirmation that 150 minutes is the entry ticket, not the VIP section. The benefits curve keeps rising beyond the minimum, then gradually levels instead of suddenly dropping off.

What actually happens to your heart when you move more

Cardiologists have been clear for years that regular exercise attacks heart risk factors on multiple fronts. Johns Hopkins Medicine notes that consistent activity lowers blood pressure, improves blood sugar control, helps maintain a healthy weight, and reduces inflammation that drives plaque and artery damage ^[4]. A peer-reviewed review in the National Library of Medicine similarly concludes that exercise cuts cardiovascular morbidity and mortality and reduces the burden of classic cardiac risk factors ^[3]^[6]. This is not wellness marketing; this is physiology and long-term outcome data lining up.

Johns Hopkins also points out that people who exercise regularly are less likely to suffer sudden heart attacks or other life-threatening cardiac events ^[4]^[7]. That is exactly the scenario many middle-aged readers quietly fear: the collapse on the court, the “out of nowhere” heart attack after years of desk work and stress. Regular, progressive training makes the heart stronger so it can pump more blood with less effort, while conditioning circulation, metabolism, and vessel health in the background ^[4]^[6].

Dose, intensity, and the case for moderation with ambition

Where does this leave someone who barely squeezes in three walks a week? The American Heart Association still emphasizes that any movement is better than none and that people should increase time and intensity gradually ^[5]. Clinically, there is a clear dose-response curve: more exercise, up to several times the minimum, generally means more benefit, but the curve is not infinitely steep ^[3]^[6].

A new study says around 10 hours of exercise weekly may significantly improve heart health ❤️

🏃 Brisk walking, running & cycling were linked to lower heart attack and stroke risk
💪 Experts say fitness goals should be personalised, not one-size-fits-all
👀#HeartHealth pic.twitter.com/JiXqvQVWPc

— Onlymyhealth (@onlymyhealth) May 22, 2026

On the other side of the spectrum, some commentators warn that very high volumes, especially of intense endurance work, could carry trade-offs for certain individuals. The review literature notes potential adverse effects of extreme training in specific contexts, even while confirming strong overall benefits for most people ^[3]^[6]. That argues against faddish extremes and for a personal “sweet spot” somewhere between the government minimum and the elite-athlete maximum, calibrated to age, fitness, and medical history.

Translating the “sweet spot” into a weekly plan you might actually follow

So what does this look like in real life for a 40-plus adult who does not want to live in the gym? A practical interpretation of the research is to aim first for the classic 150 minutes per week of moderate exercise—brisk walking, easy cycling, swimming—spread over most days ^[5]. Then, as fitness improves, push toward 300 minutes, and eventually into the 300–600 minute band if recovery, schedule, and joints allow ^[3]^[5]. Those who prefer higher intensity might target 150–300 minutes of genuinely vigorous work instead ^[3].

Layering in resistance training two days a week, as mainstream heart guidelines recommend, bolsters muscle, insulin sensitivity, and long-term independence ^[4]^[5]. For many Americans, this is less a matter of discovering a secret biohack and more about accepting that the culturally comfortable “bare minimum” is exactly that—bare. The new data do not abolish the 150-minute rule; they expose it as a starting line. For a heart that is truly protected, the real race happens well beyond it.