If you want to achieve your objectives, you have to be prepared for a daily dose of pain or discomfort. At first, it's unpleasant and demotivating, but in time you come to realise that it's part of the process of feeling good, and the moment arrives when, if you don't feel pain, you have a sense that the exercises aren't having the desired effect.
Paulo CoelhoThe River adapts itself to whatever route prove possible, but the river never forgets its one objective: the sea. So fragile at its source, it gradually gathers the strength of the other rivers in encounters. And, after a certain point, its power is absolute.
Paulo Coelho