While it's not learning necessarily, I can tell you that on the days where I get to the gym to do some sort of cardio before work, I can obtain and maintain foc

While it's not learning necessarily, I can tell you that on the days where I get to the gym to do some sort of cardio before work, I can obtain and maintain focus all day, especially if I eat light. As another anecdote, my 10-15 minute bike commute also helps greatly with focus. On days when I get up and drive to the office, by 3:00 PM, I'm dragging.