The present invention relates to a chair (6), which in particular in the form of an office chair can be formed, which an adjustable seat surface (2a), and which can comprise at least one resistance transducer comprises. The resistance transducer is assigned to a sitting areas-adjustment. In other respects, the invention relates to a exercising apparatus, in particular formed as an office chair, it is exercising apparatus. It comprises a seat back (7), a seat, a relative to the backrest adjustable seat area (2a) and at least one resistance emitters. The resistance transducer is assigned to the sitting areas-adjustment. The present invention also relates to the use of a chair as exercising apparatus (6) for training of the muscles.
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