I started yoga while still in bed. It rehabbed me from having been totally atrophied and hardly able to stand more than a couple of minutes. Yoga got me out of bed after being bedridden for many years. It took months of raising one arm and a time, one leg...turning the foot around, then the hand. Micro movements quite often in fact.   Mindful slow repeated movements in bed! Start experimenting and use YouTube. Make as many adjustments as you need and don't worry about form.