Rolling tailbone up off of floor, pressing low back into floor
rolling tailbone towards floor, low back arch increases
2. Supta Padangusthasana (Hand to foot pose) with a strap
Bring one leg up into the strap and extend your leg. Keep your knee over your hip, even if your leg doesn't extend all the way! See if you can keep the gentle arch of the low back.
3. Standing on block --> 1 knee into chest
Stand on a block (or stair) to improve balance, and bring the opposite knee into your chest. See if you can do this without rounding the back!
*My shoulders are a bit forward and rounded - I had my computer on a 3 second timer and was rushing to get onto that block!