He created a relaxed less formal environment
in the classroom, where any student if they were needing help, could seek his attention
in a comfortable and encouraging spot. It worked so well, the students preferring to go to him when they needed, that he didn't go back to what he use to do when he got back on two legs again.
Other things to consider is how much energy sustaining foods you eat, could high energy meals and snack foods between each lesson help?