"Meta-analyses show fiction reading has stronger associations with cognitive skills than nonfiction, with medium-sized benefits for verbal abilities and general cognition. Fiction enhances social cognition by exercising the brain's default network involved in theory of mind. Reading fiction increases brain connectivity, particularly in language areas and sensorimotor regions, with effects lasting beyond the reading session."
As far as I can tell, as far as your entertainment options go, literary fiction is THE best option to exercise your mind.
Ranked, in order, it's: literary fiction, nonfiction, computer games, movies, TV.
"Meta-analyses show fiction reading has stronger associations with cognitive skills than nonfiction, with medium-sized benefits for verbal abilities and general cognition. Fiction enhances social cognition by exercising the brain's default network involved in theory of mind. Reading fiction increases brain connectivity, particularly in language areas and sensorimotor regions, with effects lasting beyond the reading session."