According to Anthony Carey of Function First, your pelvis's position determines the alignment and function of your spine and outer extremities, which affects your posture when you move. Your pelvis tilts in three directions: forward and back, side to side, and rotation. If it goes off-balance in any...
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Your achy knees while running may be due to weak hips. Strengthen the hips and running may be enjoyable again...not too mention much smaller hips:) - Good to keep tucked away in case I need it.