Question

It is advised not to carry load on the head while climbing up in hill roads​


EXPLAIN WHY​
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Answer 1

If you’re standing upright on a flat surface you cannot move forward unless you move your centre of gravity forward first, and you do that by first leaning forward. You are unaware of this because it is a learned behaviour. The steeper the slope, the faster you want to go, (or the bigger the pace you’re taking) the more you have to lean forward. Lean too much and you might fall forward.

For the same reasons of physics and learned behaviour, you have to lean backwards when going down a slope to prevent yourself going too fast. Lean too much and you’ll fall backward. :-)