Want to make your brain stronger and younger? Try lifting some weights. Besides toning your muscles, researchers from the University of British Columbia found that lifting weights twice a week can help preserve the white matter in your brain that connects messages between the different regions of the brain. The study also found that weight training improves walking ability in aging people and that it works significantly better in strengthening the brain than other exercises such as balance and flexibility training. Just make sure to lift at least twice a week.