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The wedge shape of this seat cushion brings the spine into an upright position and can thereby strengthen the back muscles. The tongue on the front can also train the internal muscles of the legs. The seat hardness of the mobile cushion can be regulated through a valve with the help of a commercially available ball needle. This is especially important for gymnastic exercises. Each mobile pillow comes with a brochure with varied exercise suggestions to strengthen the back, abdominal, buttock and shoulder muscles as well as to promote balance and coordination.
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