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I wanna try these to strengthen my back muscles. I have some injuries, so I'll have to be cautious. I notice that a couple of the illustrations demonstrate people hyper extending their necks, as well as others bending their backs while jutting out their chins. Never, never, never do either of these! Keep your head in line with your spine, or you will develop terrible neck pain. Additionally, I am a former dancer, and you should always try to keep your shoulders back (as if squeezing them togethe
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