A muscle-stretching apparatus, which comprises a frame that incorporates a first and a second group of rods, wherein the frame is in turn made up of two parts mutually linked by said rods through fastening means； and the second group of rods is longer than the first group of rods； the parts being flat in nature and having a similar geometry, and being adapted for resting on the ground； and in use, the parts are arranged symmetrically to one another, relative to a plane perpendicular to the ground； the variable height of the second group of rods relative to the ground in their arrangement between the parts determining the useful height H of the frame relative to the ground.
