slamming my back on the floor means sitting on the floor cross-legged and forcfully laying back really hard. It's really not as bad as it sounds and the relief it supplies is totally worth it I can stretch on a chair back all day and not loosen up the spine as well as a sudden blow. found that out one day when someone rear-ended me on an on-ramp.

God doesnt give us what we can handle; God helps us handle what we are given.