For example, the Tosenkyo in Asakusa Tokyo, defines the rule for player's attitude strictly.
Set the cushion at the distance of 1.6 meters from the target, then sit on the knee.
OK!
Your knees SHOULD NOT get out from the cushion. And keep your hip touched your heel.The following pictures show you the bad manner.
@
No good!!
If you keep this position, you can approach your fan as possible. In this time, put your opposite hand at your knee. Don't touch the mat.
Toss the fan with pushing your thumb lightly. Then the fan will rotate and fly to the target.