Flexion of forearms with the barbell in the back

Move the wrist or forearm without shifting the elbow or losing hand alignment. Control both directions, especially when resistance is used. Prioritize control over speed. Maintain useful tension through the range and deliberately reset the starting position before the next repetition.

Do not turn the final repetitions into fast or partial movements. Aim to load forearms without sacrificing position; at intermediate level, progress control first and then add load, repetitions or complexity.