Reading can activate both sides simultaneously and works to boost brain performance in its entirety. This is because different things can be going on while you read, for example learning a language works one side of the brain but singing can work the other side of the brain. More research is required to fully understand the most complex organ.
For additional brain-boosting exercises, along with a side-by-side comparison of the left and right brain, please see the accompanying resource.
Graphic created by Master Pieces, Inc, retailer of jigsaw puzzle sorting trays.