Well that was interesting. My observation is that the fallen person needs a lot of strength in their core, arms and hips to get up from some of those positions. And the right objects to assist. Who has a sofa that has a pull out bed to lean on, or speakers that are not wired and right where we fall? I practice getting up without using my arms. It isn't always possible but I can do it a lot of the time. I suggest getting on the floor and figuring out how to get up, with whatever your body can do, and with whatever items you have handy, assuming no injuries from the fall. And practice this.