Cardio plus strength—both matter

Most people treat exercise like a custody battle between walking and weights, but the current answer from cardiology is that the heart does better when it gets both. A cardiologist interviewed by TODAY said aerobic exercise and strength training work through different pathways, so picking only one leaves benefits on the table. (today.com) Aerobic exercise is the work that keeps you moving long enough to breathe harder, like brisk walking, cycling, or swimming. The federal guideline for adults is at least 150 minutes a week of moderate aerobic activity, or 75 minutes of vigorous activity, plus muscle-strengthening work on 2 days a week. (odphp.health.gov) Cardio trains the pump. The American Heart Association says aerobic activity helps the heart and lungs deliver oxygen more efficiently, and consistent aerobic exercise is linked to lower risk of cardiovascular disease. (today.com) (cdc.gov) Strength training works differently because it loads the muscles instead of mainly challenging sustained breathing. The American Heart Association’s 2024 scientific statement says resistance training can lower blood pressure, improve insulin sensitivity, and help cholesterol and body composition, all of which feed directly into heart risk. (acc.org) (ahajournals.org) That is why walking every day does not fully replace lifting, and lifting twice a week does not fully replace walking. One improves endurance and how well your body moves blood over time, while the other helps preserve muscle, glucose control, and the strength you need to keep doing daily activity as you age. (today.com) (heart.org) The evidence for strength work is stronger than a lot of people assume. A 2022 systematic review in the British Journal of Sports Medicine found muscle-strengthening activity was associated with a 10% to 17% lower risk of all-cause mortality, cardiovascular disease, total cancer, diabetes, and lung cancer. (bjsm.bmj.com) (cir.nii.ac.jp) The same review found the biggest reduction in all-cause mortality showed up when muscle-strengthening activity landed around 30 to 60 minutes a week. It also found added benefit when strengthening was combined with any amount of aerobic activity, which is the clearest case for doing both instead of arguing over which one wins. (bjsm.bmj.com) This matters even more with age because the body loses muscle and power over time, and that changes what “heart health” looks like in real life. Federal guidance for older adults specifically recommends multicomponent activity that includes balance, aerobic movement, and muscle-strengthening work, because staying upright, carrying groceries, and climbing stairs are part of staying alive and independent. (odphp.health.gov) The practical version is not fancy. A week with brisk walks on most days and two short sessions of resistance work with dumbbells, machines, or body weight matches what the major guidelines already say, and it lines up with the cardiologist’s bottom line in the April 9, 2026 TODAY piece: for heart health, cardio and strength are partners, not substitutes. (today.com) (heart.org)