Struggle to get out of bed in the morning? According to one study, it's because you're smart. A study published in the Journal of Health Psychology suggests that people who are more active spend less time exercising their brain. While those of us who are lazy tend to use our brains more.
Researchers at Florida Gulf Coast University tracked the physical activity of 60 undergraduate students for a week after dividing the students into two groups: those who engaged in and enjoyed "effortful cognitive endeavors," and those that had less desire to do so.
Professor Todd McElroy told Broadly that people who enjoy working through challenging puzzles have a high need for cognition (NFC). Those who enjoy doing more mundane tasks and not stimulating their brain have a low NFC.