Impact Ball

I use to have one but to be honest it's another on a long pantheon of training aids that I got, tried and dispatched to a dusty corner quickly. Can your pro get one cheap if he thinks it'll really make a difference. What is he trying to acheive with it
 
I typed the original question from the office, on returning home it turns out having an 8 year old means I have any number of items that will do the job!
Homer, keeps my arms more in sync with my body, also helped with "flying" right elbow, keeping it more under the club.
 
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