Practice being "here and now" during the day.
The more you practice the easier it is to connect to the activity you are doing and the easier to feel good.
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And you realise that the moment you are present, you can "choose" how to feel.
And come to the conclusion that "happiness is here and now".
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There are times where you need to think of the past or future and that is fine.
The rest of the time, "come back to the present" and feel alive.
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