The Sport-Thieme Retro Dumbbell: For beginners and professionals. The Sport-Thieme Retro is a dumbbell available in various weight levels, allowing you to train optimally according to your fitness level. Beginners are best suited for lighter weights, while advanced users can excel with heavier weights. With this fitness dumbbell, you primarily strengthen your back, shoulders, chest, and abdominal muscles. Weight: 8.0 kg • Material: Cast iron • Color: Black-Grey.