I think the thing with "manifesting" is it's almost impossible to write something down a 100 times a day, everyday without also doing other things about the goal, as it's on your mind so much. Obviously if you write "I'm going to become an olympic athlete" but just sit on a chair nothing will happen. But if you're writing that daily you're going to end up doing more exercise because you're thinking about it. You might spot opportunities that you would otherwise miss because your brain stops skimming over it because it's such a repetitive pathway now.

And while that obviously has limits, and is far from the magical technique some might claim - it's very hard to argue against things that work.