People who regularly do aerobic exercise, such as running or cycling, use less energy to perform the same amount of physical work over time.

We analyzed the available research on whether repeated aerobic exercise improves movement economy and reduces energy expenditure, and what we’ve found so far suggests that many people who regularly do aerobic activities like running or cycling tend to use less energy to do the same amount of work over time [1]. This pattern was observed in 48 studies, while 30 others did not find the same result. Movement economy refers to how efficiently your body uses energy during physical tasks — like how much oxygen you need to run at a steady pace. When someone becomes more economical, they can do the same workout with less effort, which may help them go longer or feel less tired. The evidence we’ve reviewed shows that this improvement often happens after weeks or months of consistent aerobic training, possibly because the body adapts by refining muscle coordination, breathing patterns, or how it uses fuel. But not all studies agree. Some found little to no change in energy use, even after regular exercise. This could be due to differences in how people train, their starting fitness level, or how movement economy was measured. We don’t know yet why some people show clear improvements while others don’t. So far, the evidence leans toward the idea that aerobic exercise can help make movement more efficient for many people, but it’s not guaranteed for everyone. The changes are subtle and build slowly — they’re not the same as getting stronger or faster, but they can make daily movement feel easier over time. If you’re doing regular cardio and notice you’re not getting as winded or you can maintain the same pace with less effort, that may be your body becoming more economical. Keep going — it’s one of the quiet, useful benefits of staying active.