gym equipment 3d model

Generate a high-quality 3D asset set of gym room tools: a pair of chrome dumbbells with textured rubber hexagonal ends, a standard Olympic barbell with weight plates (2 large plates per side) and a spring collar clip, a weight rack with a few additional small accessories like a lifting belt, a chalk bag, and a steel kettlebell. All objects should have realistic PBR materials (metal, rubber, cast iron, fabric), realistic proportions, and be optimized for game engines. Place them as a grouped but separable set on a dark rubber gym floor mat with subtle studio lighting. No human characters, no other furniture. Output as a single glTF or OBJ file with separate meshes per object.