Why is it ‘illegal’ to take a breather at work?

I’ve been employed for 10 days.
im still in training.

Day 1, the trainers told me ‘Always look busy’.
Never just stand around, & They meant that literally.
If they notice me standing around doing nothing they’ll chew me out.

I just got chewed out again.
there's not much work today, I was told to sit and wait for a minute.
Someone saw me waiting around & chewed me out.

Why can’t some people just accept that there’s nothing to do? Why can’t i just sit around & wait for work?

He made me take out random trash since I had nothing to do
Why is it ‘illegal’ to take a breather at work?
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