What's Better to Work on Strength or Weakness?

When we ask this question about what's better to work on, strength or weaknesses, the first question has to be, what's the goal? I think you should choose things that are easy, and then you should work hard on the parts of it that you're not good at. So once you've decided, i want to be a great home cook, or want to run the hundred meter, then you're in the training phase where you have to actually remediate weaknesses. But when marty said that expression, when you are working on your weaknesses, you're fighting the mountain,. You have to ask why those are your weaknesses in the first place.