Build a solid six pack with these 3 KILLER core-strengthening moves! – http://muscle.ms/3AbMoves pic.twitter.com/R7FiN6xOc1

Build a solid six pack with these 3 KILLER core-strengthening moves! – http://muscle.ms/3AbMoves 

First seen here > https://twitter.com/Muscle_Strength/status/870052348936278016

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