Physical activity guidelines.
Winterfeld
Amy
A
NCSL--Denver, USA. amy.winterfeld.ncsl.org
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D015444:Exercise; D035082:Federal Government; D017408:Guidelines as Topic; D006801:Humans; D008875:Middle Aged; D014481:United States