If you want good performance will need to give priority to specific goals and challenges because of the difficulty and the challenge will be the source of motivation in the clutch in order to succeed.
If you want good performance will need to focus on specific goals more difficult and challenging. Because of the challenge and the harder it will be a source of motivation to pursue success.
If you want to good performance needs to focus on a specific goal, difficult and challenging. Because of the challenge and difficulty is the source of motivation in the clutch to succeed.