I frequently take a book or a few study sheets with me to the gym. And I'm not even in school anymore. Given the large amount of oxygen and blood flow the body sees in the gym, it makes sense to read a bit between sets.
In grade school, the kids who stretch and walk around will score higher on tests. Hell, even chewing gum increases oxygen to the brain and kids score higher.
I still remember training 6 years back with the OSI model printout by my side
