Just Pinned to Fitness: Sculpting a whittled middle means calling into play all of your core muscles, from the rectus abdominus (AKA the six-pack) to the transverse abdominus to the internal and external obliques. https://www.pinterest.com/pin/722264858959330474
source http://fitnessproductsuk.tumblr.com/post/153818050256
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