your **** must contact the back of the heel, and the toes must be in contact with the ground!
in otherwords your not allowed to tilt the foot and sit on it!
also when in this position the leading arm, the wrist must be forward of the knee!
in otherwords you cant rest your hand on top of the knee!
theres differance aswell with using cushions for the two disciplines!
in H.F.T. you can only use the cushion to protect your knee!
in F.T. you can effectively roll or stuff the cushion under the shin!
if you have a cushion handy try it and see the differance!
it's a lot harder to shoot in this position if your not supported!
hope this helps you in some way!!!
rgds
kenny