As far as I can tell -

Up on the wire, I like to climb and play with the
sky;

the people far below,

the air is clear, and I can perceive the whole
world is smiling.

Life is sublime, when you dare to go up in the
air and leave the earth up(?)

behind you,

As I step and dip and leap into the space beyond,
up high

just for a moment,

alive, and so afraid but alive, as I push against
the sky

and my heart has broken(?) free.

Fear turns to joy, when you can race the edge of
the sky

Life's intense and strong

It's not too long, before you will run beyond
your horizons.

Up on the wire, the line is thin and you must go

and (surf?) against the sky so precisely.

But life is to go on as far as you can see

up high, just for this moment

Alive, yet so afraid, but alive.

And the wires disappear, and you've finally
broken free.