As you know 'abs' is short for 'abdominal muscles', but I can't offer any help with the meaning of this passage. I began to suspect the validity of this text by the second word, which should be faster . Rover
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Newguestas this holds your abs in...as this holds your abs firmly in position.
NewguestI'm also not 100% sure what the author means by giving my back "support".Same as above. Just substitute abs for back.