A thought while at the gym today:
True happiness is the striving for more.
Once you got the thing, you aren’t “happy” anymore. Happiness is the joy of overcoming difficulties, challenges, the joy of battling an obstacle/opponent.
This means:
Never stop striving for more.
What is ‘striving’?

‘Life is a beautiful struggle.’
MOS DEF
The word strive is similar to the word ‘strife‘ — which literally means to fight (war).
Fighting is fun. To fight obstacles, and fight ourselves.
I think there is an innate desire we have to overcome challenges and opponents. The boxer probably has more joy in the action of fighting, than the winning.
I know for myself, the act of shooting photos is pure joy. I also enjoy looking at my photos afterwards, but the fun challenge of shooting the photos is the reward in itself.