This is accomplished in embodiments in this invention by a knee support which restrains {TAIL ~ the buttocks} from sliding forward and maintains the users back against the back of {HEAD ~ the chair} 
This is accomplished in embodiments in this invention by a knee support which restrains { TAIL ~ the buttocks } from sliding forward and maintains the users back against the back of { HEAD ~ the chair }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD