Crucifix Curl Single Arm targets the biceps individually for balanced development. Stand holding a dumbbell in one hand with your arm extended out to the side, palm facing forward. Curl the dumbbell toward your shoulder while keeping your elbow slightly bent and upper arm stationary, then lower with control. This exercise enhances bicep strength, symmetry, and peak definition. Gymcheq emphasizes precise motion and proper posture for safe, effective results.