Functional Trainer Low-poly 3D model is available on CGTrader for $35. Original author: jdennis. Specs: 700000 polys, 349525 verts.
STL (Stereolithography, filesize: 187 MB), OBJ (OBJ, filesize: 370 MB), 3DS (3D Studio, filesize: 236 MB), FBX (Autodesk FBX, filesize: 185 MB), DXF (DXF, filesize: 709 MB), JPG (JPG, filesize: 4.59 KB), GLTF (glTF, filesize: 85.3 MB)