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by Klaassen, Curtis; Watkins, John
by Klaassen, Curtis; Watkins III, John B.
by Klaassen, Curtis
by Casarett, Louis J.; Klaassen, Curtis D.; Watkins, John B.
by Watkins, John B., III; Klaassen, Curtis D.
by NSCA
by NSCA -National Strength & Conditioning Association