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Think you don't have any willpower? Not true! As Stanford health psychologist Kelly McGonigal, PhD, discusses in this "Today Show" segment, the latest research on willpower suggests that everyone possesses a level of self-discipline but that for many of us stress, poor nutrition and sleep deprivation makes it weak. Watch the video above for tips on how to strengthen your willpower and stick to your New Year's resolutions.
Previously: The science of willpower