On the face of it, this sounds like some intellectual irony but take time to assess things and you may agree with the research.
According to a new research, brainy people spend more time lazing around than their active counterparts.
Researchers from the Florida Gulf Coast University have found that, people with a high IQ get bored less easily so they are able to spend more time engaged in thought.
The study says that, active people always have to keep doing external things to stimulate their minds to escape their thoughts or because they get bored quickly.
To come to this conclusion, this was done:

The researchers, led by Todd McElroy, then selected 30 ‘thinkers’ and 30 ‘non-thinkers’ from the pool of candidates.
Over the next seven days both groups wore a device on their wrist which tracked their movements and activity levels, providing a constant stream of data on how physically active they were.
Results showed the thinking group were far less active during the week than the non-thinkers.

According to UK’s Independent,

The findings of the study, published in the Journal of Health Psychology, were described as “highly significant” and “robust” in statistical terms.
But the weekends showed no difference between the two groups, something which has not been able to be explained.
Researchers suggested the findings could lend weight to the idea that non-thinkers get bored more easily, so need to fill their time with physical activity.