Doing light, steady exercise like brisk walking regularly can significantly boost your heart and lung fitness—even if you're just starting out. That kind of improvement could lower your risk of dying from any cause by over 10%.

Doing light, steady exercise like walking or slow cycling can help your body use oxygen better during everyday activities and may lower your risk of heart problems over time.

Even light exercise can be good for your heart and fitness, but the harder you work—within a low-intensity range—the more you’ll improve. There’s no ‘too easy’ when it comes to getting some benefit from light workouts.

Doing short bursts of intense exercise might boost heart fitness more than steady, moderate workouts for people with heart disease — on average by a small but measurable amount.

Both short, intense sprints and steady, moderate workouts boost teenage boys' stamina just as much after six weeks — either way, their bodies get better at using oxygen.

Doing steady, moderate exercise regularly can noticeably boost your fitness level — especially if you're out of shape or older — with real improvements in how well your body uses oxygen after just a few weeks.