Optimistic really ought to be a verb
It's something you *do*, not some property you happen to possess. Sometimes it's easy to do, and sometimes it's darned hard, requiring imagination & determination
in times of intense stress or adversity, future-oriented thinking such as hope may be more effective than mindfulness in sustaining positive mindsets and action-oriented outcomes such as engagement.
Research has shown a staggering number of health benefits associated with dispositional optimism, from improvements in cardiovascular health, to how quickly wounds heal, to slower disease progression.