I'm having a sciitac issue as well as bursitis but am managing to get my ribs close to the floor when attempting to flatten the wrists. the wrists won't flatten fully. I do have a posture/stress issue being behind a pc all day and I try to be aware of posture but that falls by the wayside in intense situations. Just got a new pc chair at home which does help me to sit straight but being tired in the evening allows me to slide down in the-position again. I watched your crossed leg sciitac exercise that I can do at work and will be trying it several times a day to do a piriformis stretch .