[Oblique Barbell Curl] mainly exercises the biceps. 1. Sit on an inclined bench (preacher's chair), or you can stand in a standing position, with your chest leaning on the inclined board, your upper arms on the inclined board, holding the barbell with both hands behind your back, and keeping your arms straight to keep your body stable. 2. Curl the barbell to the highest point with force and pause for a moment. 3. Then slowly restore, pay attention to the arm should be fully extended, the movement should be slow, the elbow joint should be slightly bent when the barbell reaches the lowest point, and control the barbell with force, but do not fully extend.