Sit-ups Are Stupid & Crunches Are Crap : How to Strengthen Your Core, Get Great Abs and Conquer Back Pain Without Doing a Single One!, Paperback / softback Book

Sit-ups Are Stupid & Crunches Are Crap : How to Strengthen Your Core, Get Great Abs and Conquer Back Pain Without Doing a Single One! Paperback / softback

Paperback / softback

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