Effort refers to the work put into something. If you do not put forth your best effort then you are more likely to fail in achieving your goals, but if you give something all of your efforts then you have accomplished much even if the end goal is not met. The effort required to move a 5 lb block is far less than the effort needed to move a 500 lb block.
Impossible is a word to be found only in the dictionary of fools.
Be miserable. Or motivate yourself. Whatever has to be done, it's always your choice.