Good stress also exists, but we're generally focusing on negative effects of stress as that is what causes us problems.
Examples of good stress are physical exercise, mental challenges, emotional elation, spiritual fulfillment. Many or most activities we enjoy place us under pressure, thus we are technically under stress while performing them.
The difference is that we are wholeheartedly choosing these pressures, with both our conscious and subconscious minds. There is no conflict within - we enjoy the experience of good stress. (Of course, it's best to keep a sense of balance.)
Look for these kinds of pressures and embrace them. Without good stress we grow complacent, indifferent or simply bored, but with good stress we are who we want to be - we feel truly alive!