I buy into the idea that we really can’t think two things at once. Our family physician once told me, even tho’ he had a full cadre of patients in the waiting room, that “he could work on only one patient at a time, and not think about the others waiting.” — and that patient was me, and Iwas glad.
Whatever task we choose, we should give it our full focus. Part of the strategy then becomes selecting the “right” task.
Choose the right thing to work on. Then focus totally!