What Causes A Lack Of Motivation?

In general, we all know what we need to do to get what we want from life – take a course at night, spend more time with friends, or perhaps lose some weight. Why then, are people constantly complaining about not being able to do these things? If you’re a devotee of the saying “when there’s a will there’s a way,” the only possible conclusion in most cases is that it’s the will, or rather the motivation to take concrete action, that’s lacking.