A great book is Functional Training for Sports by Mike Boyle. If you want golf specific then Mark Verstegen's golf version of Core Performance would work. I would highly recommend either or both books.
Matt
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"In my experience, if you stay with the essentials you WILL build a repeatable swing undoubtedly. If you can master the Imperatives you have a champion" (Vikram).
The reason you can't sustain the lag is because you are so eager to make the club move fast (a reaction to the intent of "hitting it far"). So on a full shot you throw it away too early, which doesn't happen for your short chip. (bts)
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