When hanging from a hang board, it is generally recommended to avoid locking out your joints, especially your elbows and shoulders. Instead, maintain a slight bend in your elbows and engage your shoulder muscles. This position not only helps prevent injury by distributing the stress evenly across your muscles and connective tissue, but also promotes muscle strength and endurance development more effectively than hanging with fully locked joints. However, always listen to your body, and if you feel any pain or discomfort, stop immediately and consult a professional if necessary.