A human.

I'm never free and never held.
I can be straight as well as bend.
I'm lost and found the same time.
I'm a poem in one line.

I can be running when I'm standing,
Stupid as well as understanding.
I can fly high with feet on ground,
Be at the same time prey and hound.

I aim precisely with eyes closed.
I need some more when overdosed.
I'm soft as marsh-mellow, hard as stone.
I am a man - Body and Soul.