Flex Yoga and Massage - How to use tennis balls to release the lower back - double balls (2 balls tied together in a sock, or peanut shaped balls like the #bakball )
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Amazon.com: Tune Up Fitness – Therapy Ball PLUS Pair in Tote | Lacrosse Ball Upgrade - Massage Therapy Balls for Myofascial Release | Neck, Lower Back Pain, Sciatica, Shoulder Tension Relief, Physical
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