Using heart-rate monitors and GPS trackers, scientists have found that within two days the Hadza do more moderate to vigorous physical activity than Americans are advised to do, but rarely achieve, in a week.
And while most over-60s in the US have high blood pressure, only 20% to 25% of the Hadza suffer from hypertension.
David Raichlen, of the University of Arizona, said his study provided a glimpse of how the hunter-gatherer lifestyle affected human evolution.
"Our bodies evolved within a highly active context and that explains why physical activity seems to improve physiological health today," he said.
Hadza men hunt with bows and poison-tipped arrows, while women gather tubers and berries. They chalk up 75 minutes of exercise a day, while Americans are advised to do 150 minutes a week.
In the US Journal of Human Biology, Raichlen said heart disease was virtually unknown in the nomadic community of less than 1 000 who live around Lake Eyasi.
"There's virtually no evidence that the Hadza people have any kind of blood lipid levels that would put them at risk for cardiovascular disease," he said.
This may not be entirely due to physical activity - diet and other factors were likely to play a role.
Hadza adults' activity levels did not fluctuate over their lifespan.
"In the US we tend to see big drop-offs in physical activity levels when people age. In the Hadza we don't see that."
The study would help scientists to understand the physical activity levels that drove the evolution of the human cardiovascular, neurobiological and musculoskeletal systems.
"The answer is not likely to be 30 minutes a day of walking on a treadmill."
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