What does +4 Performance Condition?

This popped up while I was jogging last night. What does it mean?

Oh, and I've had a bugger of a time with the VO2 max. It set itself at 21 back in April and didn't change, except last night it moved to 22. I don't run outside much; I am a gym rat. I still think it's a gol dang liar, but at least it finally moved.