why not to do sit ups and crunches
http://www2.macleans.ca/2010/01/19/the-man-who-wants-to-kill-crunches/
as i have been saying to folk for some time now.
http://www2.macleans.ca/2010/01/19/the-man-who-wants-to-kill-crunches/
as i have been saying to folk for some time now.
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