The most recent National Health Interview Survey (NHIS) reported that 32% of US adults exercised regularly in 2008.[1]This is a one percent increase from the 2007 survey. According to the 2008 survey, 32% of Americans either:

• engaged in light to moderate physical activity for 30 minutes or more at least 5 times a week; or
• performed vigorous activity for 20 minutes or more at least 3 times a week.

Women 24 and under and 65 and older were less likely than men to exercise but men and women ages 25-64 were equally matched at just over 30% each. Participating in physical activity was shown to decrease with age for both men and women but with a steeper decrease for women than men.

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[1]CDC/National Center for Health Statistics. “Early Release Measures: Leisure-Time Physical Activity.” June 2009. Figs. 7.1 and 7.2 http://www.cdc.gov/nchs/data/nhis/earlyrelease/200906_07.pdf