Answer:
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
What is light as a feather but even the strongest man cannot hold it for more than a few minutes?
I begin and have no end and I end all that begins. What am I?
I run through hills. I veer around mountains. I leap over rivers and crawl through the forests. Step out your door to find me. What am I?
I make you weak at the worst of all times. I keep you safe, I keep you fine. I make your hands sweat and your heart grow cold. I visit the weak, but seldom the bold. What am I?
What is full of holes but still holds water