Carbohydrates, Proteins, Fats, and Blood sugar. The body uses three main nutrients to function- carbohydrate, protein, and fat.
It will be Josh who gets his target THR. His range is within 135 bpm—175 bpm while the actual heart rate was 165 bpm, deducting it with 20 bpm results to 145 bpm - falling to the 135 bpm—175 bpm THR range. Although doing the same method as Josh's results to 165 bpm for Dominique, it doesn't fall to his 150 bpm—183 bpm THR range.
THis would be the cortex this is at the top of the stem of the brain.