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NewsGetting kids moving could pay off for decades. A Penn State study found that physical activity during development makes movement more energy-efficient in adulthood — birds raised carrying weights used 23% less energy walking with a load than untrained birds. Researchers say the same principle likely applies to humans, with big implications for lifelong health.
Getting kids moving early could be one of the best long-term health investments we make. A new Penn State study published in Proceedings of the Royal Society B found that physical activity during development can permanently change how efficiently the body moves — meaning less energy spent, and potentially less resistance to exercise, in adulthood.
Researchers attached small weights to one leg of young guinea fowl (two-legged walkers, like us) and tracked their energy use into adulthood. The results were striking: birds that grew up carrying the weights expended no extra energy with the added load as adults, while untrained birds burned significantly more doing the same thing.
Lead researcher Jonas Rubenson notes that today's children are far less active than previous generations — and this study suggests that gap could have lasting consequences for adult health and fitness motivation.
By the Numbers
Why it matters: If the same adaptation holds in humans, low childhood activity could make exercise feel harder throughout life — creating a cycle of inactivity with downstream effects on heart health, mental health, and overall well-being.
