System for performing physical exercises comprising a first device (100) that includes a first frame (100) fixed to a first plate (110), substantially extending along a first longitudinal axis and comprising a first central slot (115) that is entirely contained therein and extends along the first longitudinal axis, configured to housing a spine of a user during stretching exercises, a first edge of the first slot (115) and a first end of the first plate (110), transversal to the first longitudinal axis, delimiting a first head portion (111), the first plate (110) being configured to support the user when lying supine on it with the head on the first head portion (111), the system including at least two support elements (117) having support edges with a circumferential profile fixed to the first frame (120) on the side opposite to the first plate (110) whereby the first device (100) is in an unstable equilibrium when it rests onto a plane through the at least two support elements (117).
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