If you need to power through a task that requires brainpower and concentration – get up and swing your arms. Dr. Woodson Merrell is chairman of integrative medicine at New York’s Beth Israel Medical Center. And he says one the quickest ways to energize your body and brain is to swing your arms across your torso as you walk. Our natural energy moves from side to side – but when we’re in a slump, that energy gets stuck and stops moving. So swinging our arms to the opposite side of our body gets our energy crossing over again. That wakes up the brain by triggering activity in both hemispheres.