Strength doesn't come from what you can do, it comes from overcoming the things you once thought you couldn't.
There are always those moments on your fitness journey where you start to feel amazing, and you start having those moments where you realize you're doing things you once thought impossible.
Maybe its performing that perfect squat, or hitting a personal best. Or maybe its the thought that you actually feel and move a whole lot better than a few days, weeks, or months ago.
That's real strength.