Mentally, he's as strong as an ox.

That is why the ox has to be strong, and its handler too.

I arrived in Hollywood twenty pounds overweight and as strong as an ox.

You think you're strong as a person. You're mentally prepared for certain situations. But yet when something terrible happens, you feel weaker than anyone.

Nobody is going to tell me Marshawn Lynch can't run. He's strong as an ox.

He has played 48 Test matches as captain and is mentally very strong.