What are the proper techniques for performing standing straight bar curls to maximize muscle engagement and prevent injury?

To perform standing straight bar curls effectively and safely, start by standing with feet shoulder-width apart and gripping the barbell with hands shoulder-width apart. Keep your elbows close to your body and curl the barbell towards your chest while keeping your back straight. Lower the barbell slowly and controlled to the starting position. Avoid swinging or using momentum to lift the weight, as this can lead to injury. Focus on engaging your biceps throughout the movement for maximum muscle engagement.