From LivingPianos.

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Welcome to LivingPianos.com, I’m Robert Estrin. The subject today is about the importance of practicing with raised fingers. Playing the piano with raised fingers is a completely different scenario from practicing the piano with raised fingers. I want to qualify this right out of the gate so you don’t get scared that I’m telling you to do something that could lead to injury. This is a technique used judiciously to help you solidify your technique, but certainly not something you do in performance. You may wonder why you would do something in practice that you would never do in your performance? Well, there are very good reasons for this which I will explain now.

FULL ARTICLE:
https://livingpianos.com/the-importance-of-practicing-with-raised-fingers/