The opposite of 'nervous tensions' could be calmness or relaxation. When a person is calm, their muscles are relaxed, and their mind is at ease. They are not anxious or worried about anything, and they feel peaceful. Relaxation is the absence of stress or tension in both mind and body. This could be achieved through various activities such as meditation, yoga, or breathing exercises. When a person is relaxed, they are likely to feel confident, positive, and in control of their emotions. Therefore, it is important to prioritize activities that promote relaxation in order to reduce nervous tensions, anxiety, and stress.