This is a more obscure and new one (2013), and it may not be for everyone, because of its approach. Nevertheless, I feel it should not be excluded from this list on that basis. Train Insane is a non-BS, in-your-face guide to developing a lifelong attitude and correlating fitness program. If you want to motivate and inspire people, and build a sustainable program for others, this book can help along the way.
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Contributor: Caleb Backe from mapleholistics.com