Why do I duff my chips?

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Martin, Gotta love how you post a video where the guy duffs some chips himself. Although I kinda see what he's trying to say it shows how easy it is to accidentally decelerate and flub a chip or two.

I prefer this video as you don't focus on swinging the club thru the ball, rather just worry about where you are going to stop
I like it where he says "Put both hands right here.. past the ball"

You have to commit to the shot so determining before you swing where you are going to FINISH your swing will help make sure they get there.