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This week's STACK Beast of the Week is Buffalo Bills WR Sammy Watkins, who had nine catches for 122 yards and two TDs, including the game-winner as time ran out. Check out his off-season lower-body exercise that powers his explosiveness on the field.

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John Cissik

John Cissik

John M. Cissik is the president of Human Performance Services, LLC, which helps athletes solve their strength and conditioning problems. He has worked with athletes at all levels, produced four videos, written 10 books and published more than 70 articles on strength and speed training.... Read more about John