Become more optimistic with these exercises

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"These paper and pencil exercises ... show small effects on optimism," one expert says

Imagine your best possible future or write down what you're grateful for, studies suggest

CNN  — 

Being pessimistic may keep your heart from being broken when a best-case scenario fails to come to pass, but there are some real health benefits to seeing the glass as half full.

Optimism – having favorable expectations about the future – may be good for your heart and overall quality of life. People who are more optimistic than pessimistic tend to live longer, have better cardiovascular health, get a higher quality of sleep and have improved immune systems, studies suggest.

There are some research-based daily practices that might help you become more optimistic, said Nancy Si