Set your rib cage with an exhale. Feel the weight of your mid-back against the floor
If you are holding a yoga block, press strongly into the yoga block with your palms, particularly with the pinky finger edge of your palm. If you do not have a yoga block you can simply mimic this action with an imaginary yoga block.
Keep your ribs down and your back against the floor as you reach your arms overhead.
Pause in the extended position for several breaths.