The Arm Blaster is a retro piece of training equipment used by the 7x Mr Olympia himself - Arnold Schwarzenegger!
The Arm Blaster/Bicep Bomber has been used for decades - its function is improving both posture and form during biceps related exercises such as dumbbell and barbell curls. While lifting, the elbows can become displaced (move backwards) in conjunction with swaying (using momentum to complete the movement). This increases the risk of injury to the lower back via hyper extension. Additionally, the use of swaying and momentum does not effectively target the bicep.
The Arm Blaster ensures that all the work is being completed by the biceps muscle to give your pythons the perfect peak!