If George begins an exercise program with realistic goals, while Tom has high goals that are unrealistic, what might you expect to happen? George may become injured. Tom will probably make more progress. George will probably be more motivated in the long-run. Both George and Tom will probably make the same amount of progress.
George will eventually achieve his goal and then continue moving forward
but Tom will find his goal was to hard to achieve because he set it too
high so he will give up.