The Case for Exercise: Lower Your Risk of Death, Heart Disease, and Dementia

Moving your body — even a little — is one of the most powerful things you can do for your heart, your brain, and how long you live.

You’re likely aware that exercise is good for you. You’ll rarely hear anyone tell you to exercise less, but the specific benefits of exercise are a convoluted space. Consistent resistance training paired with a balanced diet is worthwhile for your brain just as much as it is your body. You may also think you need more exercise than you really do to see these benefits. But in general, adopting even small amounts of exercise as part of your routine can do extraordinary things, including lowering your risk of death, heart disease, and dementia.

What You Should Know About Exercise and Risk

Exercising just twice per week has been shown to decrease all-cause mortality by about 30% compared to those who don’t exercise at all. Even short bouts of dedicated movement throughout the week can be hugely beneficial. 

Adults who met physical activity guidelines of about 2.5 hours per week — alongside limiting sedentary time and getting enough sleep — saw up to a 37% lower risk of early death. If that is too much time each week, don’t worry: movement is directly correlated to decrease in mortality risk, so one hour is better than a half hour, a half hour is better than 20 minutes, and so on.

Meeting those movement guidelines has also been linked to up to a 47% lower risk of death from cardiovascular disease. Exercise helps lower blood pressure and improve insulin sensitivity.

As of 2026, an estimated 7 million-plus Americans aged 65 or older suffer from Alzheimer’s disease. The notion of “use it or lose it” seems to hold true, as people who exercise three times per week had a 38% lower risk of dementia than those who don’t exercise.

Going Deeper on the Evidence

The Physical Activity Guidelines for Americans states that a whopping 80% of its population are insufficiently active. The guideline is 2.5-5 hours of moderately intense or 1.25-2.5 hours of vigorously intense exercise per week. For reference, five hours is just 3% of the entire week.

A meta-analysis in the American Journal of Preventive Medicine of 10 studies found that just one hour of resistance training per week was linked to a 27% lower risk of death from any cause. There are 168 hours in a week, so committing about 0.6% of it to resistance training for such a huge health benefit is quite the deal.

But these metrics were reinforced by a 2026 cohort study in the British Journal of Sports Medicine, which analyzed 147,374 participants (31,540 males and 115,834 females) over three decades. They found resistance training for 1.5–2 hours per week lowered risk of death from any cause and from cardiovascular disease by 13% and 19%, respectively.

The best outcomes were those who included a half hour of cardio per week in addition to resistance training. The study also found the benefits leveled off above about two hours per week — so there’s a sweet spot, and piling on more doesn’t add much.

The Takeaway

The biggest takeaway from these studies’ findings is that consistency is king. Aim for 90 minutes of resistance training and a half hour of cardio per week. Dedicating literally just 1% of your week to exercising can significantly lower your risk of death, heart disease, and dementia. Always consult your physician before starting a new diet or training program. 

Bottom Line

While emerging research about the specific exercises and programming regarding the reduction of all-cause mortality in the future can be expected, an active lifestyle, encompassing two hours of exercise per week, appears to be tried and true for a longer, healthier life. Staying sedentary is a clear health risk, so whenever you have the chance to be active, take it.