First of all , Jump in Height instead of length
ive seen this many times, people doing backflips that will rather jump far back , instead if jumping high and landing on the same space , wich is way safer.
second use ur arms , first u jump a phew times whit ur arms straight in the air and to get a good height , then when u feel ur ready to go , throw them backwards together whit ur body , this should help turning quiker aswell
and last ofc , press ur head against ur chest and grab ur knees !!!!!!!!!!!!!