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18d • General discussion
My newest Book
Check out my latest book! Endurance Engine. A guide to performance and longevity.
Bookstore – Team Prs Fit
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Jeffrey Kline
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My newest Book
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Prs Fit
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I’m Coach Jeff, and I’ve spent years working with runners and triathletes at every level — from first-time racers to Ironman and Boston qualifiers.
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