【實用健康app】Back Exercises|最夯免費app

The back isn't only one of the body's biggest and strongest bodyparts, it's also the most complicated in terms of being a series of interconnected muscle groups. For the purposes of this feature we're dividing the back into its four main regions: 1) the upper and outer lats, 2) the lower lats, 3) the middle back and 4) the lower back.

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