The analogy is true, insofar as there are experiments that support it. https://www.google.com/search?q=willpower+muscle+research https://www.google.com/search?

The analogy is true, insofar as there are experiments that support it. https://www.google.com/search?q=willpower+muscle+research https://www.google.com/search?q=willpower+muscle+research More interestingly, there is research that suggests that believing that willpower is like a muscle impairs willpower. :) http://pss.sagepub.com/content/21/11/1686 http://pss.sagepub.com/content/21/11/1686