Isn't the term local maximum? It's the max you can get, but if you go back a few steps you can do better
Good question!
You are right, in this context would be a "local maximum", because they are stuck on "lap completion %", something you want to maximize but you can get stuck on a "local maximum".
I used "local minimum" because I was thinking on "lap completion time", something you want to minimize but you can get stuck on a "local minimum".
In short: You can use Maximum or Minimum depending of what are you measuring.