Seven months laters, the squeezers earned “considerably higher” grades than the control group.
Researchers believe squeezing builds self-control, reports Research Digest. “It takes willpower to resist giving up as soon as squeezing becomes uncomfortable.”
At the end of the school year, the squeezers studied more than those who hadn’t practiced with the handgrip. Students in the experimental group were “more willing to exert effort,” the study found.
Reading about scientists’ struggles led to higher grades than reading about their achievements, other research has found.