Supine Breathing: lower core with overhead press

Start by lying on your back, with an arm's length away from the wall overhead. Check to see if you're able to reach.
Set your core, press your low back down into the floor, ribs tucked down, and breathe in and out of your nose. When you breathe in, allow your core to expand softly (360* breathing in all directions), contract your lower core as you exhale.
Keep tension throughout your system - try not to tilt your pelvis forward or backwards as you are breathing in and out.