The Power of Tenacity By Samuel R. Chand
Ron Edmondson
APRIL 22, 2015
This strategy seems to work for a while, but sooner or later they hit a mental wall that hinders their efficiency. Gina Kolata, “How to Push Past the Pain, as the Champions Do,” New York Times, October 18, 2010, www.nytimes.com/2010/10/19/health/nutrition/19best.html?pagewanted=all&_r=0. pagewanted=all&_r=0.
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