Why does a hiker wearing a heavy backpack lean forward when walking?

Question

explain

Answer 1

The back packer is adjusting the center of gravity by leaning forward.
not leaning forward will offset the balance and in turn the backpacker will fall backwards.
Or the backpacker could be looking at a snail on the ground.

Answer 2

If you lean backwards or upright you will see gravity at it's best. You would fall over backwards!

Answer 3

he lost all his weed walking up the hill, an is looking for it on his way back down the hill,