[1] The sprawl is performed by scooting the legs backwards, so as to land on the upper back of the opponent attempting the takedown.

Ideally, the sprawling combatant should create safe hip extension as much as possible and keep his knees off the floor.

Keeping the knees off the ground creates more weight pushing down on the opponent.

The important thing is to create hip extension rather than arching the back.

Proper hip extension is created by squeezing the glutes, this in turn pulls the pelvis back upon which the spine safely follows.