$4.99 Arm pump 3D model by nemo81. Available on CGTrader. Check it out on CGHub.
STL (Stereolithography, filesize: 2.55 MB), OBJ (OBJ, filesize: 4.58 MB), FBX (Autodesk FBX, filesize: 1.9 MB), MAX (Autodesk 3ds Max, filesize: 4.57 MB), GLTF (glTF, filesize: 10.1 MB), USDZ (USDZ, filesize: 2.68 MB), JPG (JPG, filesize: 5.99 MB)