A RAD arm blaster is a piece of fitness equipment used to enhance the effectiveness of bicep curls. It is typically made of metal or plastic and consists of a U-shaped design that wraps around the upper arms, with a strap that goes around the neck and a curved section that rests against the abdomen.

The arm blaster is designed to help maintain proper form during bicep curls, by keeping the elbows in a fixed position and preventing them from moving forward. This helps to isolate the biceps and reduce the use of other muscles during the exercise.

By using an arm blaster, individuals can achieve a better mind-muscle connection with their biceps, which can lead to better muscle growth and strength gains. It is commonly used by bodybuilders and fitness enthusiasts looking to develop their arm muscles.