6 Manson, J., E. et al., «
Walking Compared with
Vigorous Exercise for Prevention of Cardiovascular events
in Women», New England Journal of... continue, 7 Hakim, A., A. «Effects of
Walking on Mortality Among Nonsmoking Retired Men,» New England Journal of Medicine 338 (1998): 94 - 99, accessed on... continue Its accessible and free AND you get to check out cool neighborhoods and
nature trails as an added bonus!