The tightness might come from the shoulder joints and poor posture as well as from the neck. Practicing mountain pose might offer some relief. Mountain pose is achieved by standing straight, arms at your sides, fingers pointing downward, focus forward, feet together chest open, shoulders down, and lifting through the crown of the head. Hold for 1-2 minutes and repeat several times each day. It has the mountain pose in there with all the others.
Breathing is the key.
Slow, even, thoughtful breathing either sitting, standing , or lying down for 1-10 minutes each day. Listen to lovely music, and focus on a positive statement such as, I am calm and at peace. It takes practice. The basic rules are breathe in when you expand the chest or move your limbs upwards and breathe out when you bend forward or twist. Also breathe out upon exertion.