“I will try my best”

I almost hate this statement. As soon as someone says it, I feel their commitment to a certain task is not complete. From my experience at work so far, I’ve learnt that you either do something or you don’t. “Try” is used by the uncommitted. I would rather someone say “I will do my best”. But even that doesn’t seem right. Can someone really do their best? How does one know what their best is unless they push themselves? When a performance exceeds all previous performances? And upon exceeding previous performances, how does one know that they can’t do any better? I think it’s impossible to achieve one’s best…only because one’s best can always get better.