Sentence examples for * hard on from inspiring English sources

I'm hard on myself.

"It's hard on everybody.

It's hard on everyone.

Yes, it's hard on children.

Inactivity is hard on marines.

She worked hard on it.

"He's worked hard on it".

It's hard on his body.

"We're working hard on it.

He's awfully hard on himself.

What is a "hard-on"?