What muscles you use and the way you use them, provides your power and your balance in your swing....
Where the power should come from and what balance is, is where the disagreements stem from....This search is where it's at, IMO......Because, rhythm and timing is a combination of power and balance....
This is why I'm against hitting off a tee....It's, also, why I believe a player needs to be able to hit some homeruns to have an efficient swing....
If a hitter is getting power and balance from the wrong muscle source, he will never reach his hitting potential....
Know where and how you are balancing and where your power source is....If someone asks you, can you answer them?
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