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Stallone says

All of us have a need to feel fulfillment in life, and that battle never ends.
That's why I put them into a body of boxer,
it's an on going round after round after round
until finally that final belt hold at the end then we stand up and see how we did.

Life has sad part.
We are always gonna take body shots from life when we least expect it.
It's gonna knock you down and the real drama in life and real victory in life
is to get in up off the ground.