Upper ab machine 3D model is available on CGTrader for $19. Original author: dragosburian. Specs: 29624 polys, 36971 verts.
BLEND (Blender, filesize: 67 MB), OBJ (OBJ, filesize: 32.3 MB), FBX (Autodesk FBX, filesize: 33.2 MB), DAE (Collada, filesize: 33 MB), TEXTURES (Textures, filesize: 33.2 MB), PNG (PNG, filesize: 33.2 MB), STL (Stereolithography, filesize: 1.27 MB)