Walking backward while juggling improves coordination and fine-tunes motor skills. Juggling itself engages cognitive processes like hand-eye coordination and spatial awareness. Doing both at once enhances multitasking abilities. While walking backwards, it forces you to throw the ball in the air more towards your body. For people like me who struggle with throwing the ball in a good area, this is a great drill for practicing.

Jack Kalvan shows this in his youtube video, while he is a professional and makes it look easy, trust me when I say I make it look incredibly hard.

If you practice it enough, it does benefit your throwing habits.