We’ve all heard the health mantra a thousand times: Get your cardio in. Doctors, fitness apps, and public health guidelines constantly remind us to walk, run, cycle, or swim to protect our hearts and live longer.

But what about picking up weights? While muscle-strengthening exercises are officially recommended, the science behind how much resistance training you actually need—and whether you can overdo it—has been a bit hazy. Until now.

A groundbreaking study published in the British Journal of Sports Medicine (BJSM) followed nearly 150,000 adults for up to 30 years. Led by researchers at the Harvard T.H. Chan School of Public Health, this massive study uncovers exactly how long-term resistance training affects your lifespan, how it targets specific diseases, and how it pairs with your favorite cardio routine.

The good news? You don’t need to live in the gym to reap massive longevity benefits. Here is what the science says about finding your fitness “sweet spot.”

The Study by the Numbers

To understand why these findings are making waves, look at the sheer scale of the data. The researchers analyzed data from 147,374 participants across three major health studies (the Health Professionals Follow-up Study and the Nurses’ Health Studies).

Unlike past research that only asked people about their habits once, this study tracked participants’ habits every two to four years for up to three decades. This gave researchers an incredibly accurate look at long-term, lifelong habits.

Finding the Longevity “Sweet Spot”

So, what happens when you regularly lift weights or do bodyweight exercises over the course of your life?

Compared to people who did no resistance training at all, those who clocked in 90 to 119 minutes per week saw profound drops in mortality risk:

• 13% lower risk of all-cause mortality (dying from any cause).
• 19% lower risk of cardiovascular disease mortality.
• 27% lower risk of neurological disease mortality (such as Alzheimer’s or Parkinson’s).

The Plateau Effect: Interestingly, pumping iron for longer than two hours a week didn’t offer any additional protection against these conditions. The benefits effectively plateaued at around 120 minutes.

The Curious Case of Cancer Risk

When it came to cancer, the rules changed slightly. The researchers discovered that more was definitely not better.

Reduced cancer mortality risk was only observed at lower levels of resistance training. Specifically, people doing 1 to 29 minutes or 30 to 59 minutes per week saw an 11% to 12% lower risk of cancer death. Once participants pushed past an hour of lifting per week, that specific statistical benefit faded. While more research is needed to pinpoint exactly why, it suggests that even a single, short weekly session is enough to spark biological defenses against cancer.

The Ultimate Longevity Combo: Weights + Cardio

One of the most valuable aspects of this study was exploring how resistance training interacts with aerobic activity. Do you still need to lift if you run marathons? Do you still need to run if you lift heavy?

The study proved that while both are great independently, they are truly “better together.”

• If you only have time for one: Engaging in either adequate cardio or resistance training alone lowers your mortality risk, though cardio carries a slightly heavier weight in slashing overall risk.
• The Power Couple: The lowest mortality rates in the entire study belonged to those who did both high-volume cardio and moderate-to-high resistance training. Combining a solid aerobic routine with 60–119 minutes of weekly lifting cut the risk of death nearly in half!
• The Cardio Exception: Interestingly, for the ultimate “cardio junkies” who engaged in very high levels of aerobic activity (equivalent to running several hours a week), the risk of death was incredibly low regardless of whether they lifted weights or not.

Your Actionable Takeaways

If you want to tailor your fitness routine based on this 30-year landmark study, here is your blueprint:

1. Aim for ~100 minutes of lifting a week: This can easily be broken down into three 30-minute sessions or two 50-minute sessions. Focus on compound movements that use multiple muscle groups (squats, rows, push-ups, lunges).
2. Don’t stress if you’re short on time: Even 15 to 30 minutes of resistance work a week moves the needle, particularly for lowering cancer risks. Doing something is infinitely better than doing nothing.
3. Keep up the cardio: Don’t trade your running shoes for dumbbells entirely. To maximize your lifespan and protect your brain and heart, find a balance that blends heart-pumping aerobic movement with muscle-building resistance work.

The Bottom Line: You don’t need to train like a professional bodybuilder to save your life. Consistency beats intensity. Find a simple, sustainable routine that gets you lifting for a total of roughly an hour and a half a week, pair it with some regular brisk walking or cycling, and you’ve unlocked the scientifically proven sweet spot for a longer, healthier life.

*** Source: Zhang Y, Lee DH, Rezende LFM, et al. Long-term resistance training with all-cause and cause-specific mortality: assessing dose-response and joint associations with aerobic physical activity. British Journal of Sports Medicine 2026;60:874. https://bjsm.bmj.com/content/60/12/874