“Your core’s weak,” Caileen says, nodding her head in woeful self-confirmation. She’s watching me struggle through a leg lift that shouldn’t be hard, one I can’t complete without tilting my hips all off kilter. It’s a compensation I can’t even detect, much less keep myself from doing, and watching me turns Caileen’s nodding to a slow, regretful head shake. “Your abs are so weak they can’t maintain your posture for you,” she says, reaching down to help me and my ego off the floor. “So your back has to work double time to make up for it. That’s why it hurts.”
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