This is an odd expression, when used in the sentence "I'm feeling a bit below par", as in, I'm not feeling that great, or I'm feeling a bit unwell. Because if you think about where the term 'below par', comes from, it's mainly used as a golfing expression. And if someone is 'below par' in golf, then they are playing a blinder and doing really well.
This morning Matilda woke feeling nauseous, so she stayed home from church with Fifi looking after her. I went to church with Ruby and Lily Violet, and then we went on to morning tea for newcomers, and I met some nice people. It was very good, and we'd heard a good sermon on love from our minister as well.
But then we got home and Matilda was still sick, and started throwing up. And just quietly, I'm now feeling a bit above par myself.