Laugh More
Laughing stimulates your endorphins and it sends a rush of dopamine into your brain. When you have more dopamine in your brain, you'll be better at focusing on and learning new things. Letting yourself genuinely feel happiness and laughter is one of life's greatest feelings.
Play Brain Games
If solving visual riddles is like doing mental pushups, playing brain games is like going for a jog. Doing crossword puzzles and playing games like sudoku and poker will keep your brain sharp for prolonged periods of time. These games will also help you focus better.