A single-sided tensioning system for the dynamic tensioning of at least one canvas provided on one side of a frame, which is assembled substantially from four or more frame profiles, characterised in that the tensioning system comprises: - a frame profile comprising a back wall with an upright central part and two upright side walls , which extend in the lateral direction (L) of the frame; wherein the frame profile is provided with at least one stop ; - a guide provided with a means for fastening the canvas ; wherein the guide is mounted movably in the lateral direction (L) in the frame profile between the central part and a side wall ; - a locking element comprising a coupling means and a blocking piece ; wherein the coupling means is configured for coupling the locking element to the central part ; - a tensioning means configured for dynamic tensioning of the canvas fastened to the guide ; wherein the tensioning means is tensioned between the stop and guide so that this guide can tension dynamically in the central direction (C) of the frame and the blocking piece is arranged so that it can block a movement of this guide in at least one direction and/or, the tensioning means is tensioned between the blocking piece and guide so that this guide can tension dynamically in the central direction (C) of the frame and the stop is arranged so that it can block a movement of this guide in at least one direction; wherein the locking element and/or the blocking piece are configured to remove said blocking of the guide by means of a displacement relative to the frame profile so that the canvas fastened to the guide is tensioned dynamically over a side wall of the frame profile by the tensioning means . - a frame profile comprising a back wall with an upright central part and two upright side walls , which extend in the lateral direction (L) of the frame; wherein the frame profile is provided with at least one stop ; - a guide provided with a means for fastening the canvas ; wherein the guide is mounted movably in the lateral direction (L) in the frame profile between the central part and a side wall ; - a locking element comprising a coupling means and a blocking piece ; wherein the coupling means is configured for coupling the locking element to the central part ; - a tensioning means configured for dynamic tensioning of the canvas fastened to the guide ; wherein the tensioning means is tensioned between the stop and guide so that this guide can tension dynamically in the central direction (C) of the frame and the blocking piece is arranged so that it can block a movement of this guide in at least one direction and/or, the tensioning means is tensioned between the blocking piece and guide so that this guide can tension dynamically in the central direction (C) of the frame and the stop is arranged so that it can block a movement of this guide in at least one direction; the tensioning means is tensioned between the stop and guide so that this guide can tension dynamically in the central direction (C) of the frame and the blocking piece is arranged so that it can block a movement of this guide in at least one direction and/or, the tensioning means is tensioned between the blocking piece and guide so that this guide can tension dynamically in the central direction (C) of the frame and the stop is arranged so that it can block a movement of this guide in at least one direction; <EOS>