Hemispheric brain dominance varies with activities and from person to person. More research is required to fully understand the most complex organ. Reading activates both sides simultaneously and works to boost brain performance in its entirely. Learning a new language can exercise the left hemisphere and singing can strengthen the right even though they both involve reading. For more information about the left vs right side of the brain, check out the below graphic.

Graphic created by Master Pieces, Inc, a retailer of difficult jigsaw puzzles.