oldschool baby....
Actually brother its a wrestling move to condititiona nd strengthen the neck girdle;
you lay flat on yer back tuck your feet under and arch your back hands suspend your upper torso tuck your head under after your head is comfortable ( I place a towel under my head so it will sere as aborption and then cross your arms on your stomach and gently rock back and forth)
hope the description helps
Get your Brother, Live strong!!!!!!!! Die well.....Bersekers!!!!!!!!!!