Taking the time to consciously breathe with the diaphragm & let the ribs expand with each breath, is a great way to reduce tension. I encourage nasal breathing as it filters, humidifies & warms the air before it hits the lungs. Breathing with your nose also further calms the nervous system. By slowing the breath down to:
5 sec inhalation
5 sec exhalation
5 second pause
A great place to focus on your breathing is in the bath. I like to use epsom salts and Radox to relax my muscles and mind.
Foam rollers are a one off purchase for life. They are are a great tool for opening up of the ribcage, improving posture & breathing mechanics and are perfect for giving yourself the best massages.