'Focus: Abs/Core Think \"Ribs to Hips\" & \"Scoop your belly In & Up\" Keep a neutral spine (don\'t jam your lower back to the ground) unless you have a tender back then you can gentle allow your back to touch the floor.  Modifications: If you\'re neck is straining - Keep your head lowered & just move your legs If you feel more in your back then your abs - shorten the range of motion your legs are moving.' 

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