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Spine standing out in the middle of the back

I've started training about 3 months ago. I had neglected my lower back training for a while before starting to train it again. Now, my body fat percentage is about 10% and my spine is very visible in ...
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Recovery plan of chronic lower back stiffness in Tennis

Most tennis players have some aspects of lower back stiffness. I think the key to become a successful tennis player is a balance between rest and playing - recovering during play and between plays ...