A garden hose would not provide anywhere close to the amount of variable resistance that the chain provides.
I agree...the article is a bit spastic...but I think there are some points to be taken away from it.
I have been lifting weights and stretching for the last 4-5 years and have gotten MUCH stronger and more flexible. However, my clubhead speed has not moved a bit in that same time span. So, for me at least, being stronger and more flexible has not translated into faster clubhead speed.
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