When holding the perfect plank, your body should form a straight line from the back of your head and neck to your heels. A straight back and engaged abdominal muscles will help the arms stay strong. Tired arms can result in an arched back or sagging hips, both of which can place undue pressure on the spine and cause backache. When one body part tires, it is best to come out of the pose instead of holding in an incorrect position.

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