Rhayun Song , the senior author on the study and an assistant professor of nursing at Chungnam National University in Daejeon , South Korea , said that keeping joints and muscles moving was essential for older people , and that '' tai chi can do it without causing pain and stiffness since it 's slow circular movements without external impact . ''
South Korea /location/location/contains Daejeon
South Korea /location/country/administrative_divisions Daejeon
Daejeon /location/location/contains Chungnam National University
Daejeon /location/administrative_division/country South Korea
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South Korea
LOCATION
Daejeon
LOCATION
/location/location/contains
South Korea
LOCATION
Daejeon
LOCATION
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Daejeon
LOCATION
Chungnam National University
ORGANIZATION
/location/location/contains
Daejeon
LOCATION
South Korea
LOCATION
/location/administrative_division/country