The key to this move is to keep your shoulders and hips perfectly still keeping your torso parallel to the floor at all times, and keep a straight line from your ears to your shoulders, and hips.

1. In a kneeling plank position look straight down at floor, keep shoulders down onto lower, rear rib cage and directly over hands.  Never allow elbows to lock.  Hold and pull slightly taught a hand towel, remembering to keep shoulders directly over hands at all times.
   
   
2. Begin with right hand dragging towel on floor, and slowly sliding/dragging hand up no more than 6 inches.  Slide/drag towel back to beginning hand position, directly underneath shoulder. 
   
   
3. Lower right hand dragging towel no more than 6 inches to navel keeping weight evenly distributed over shoulders and hips.  Keep shoulders and hips parallel to floor, trying not to allow weight to shift.
   
   
4. Repeat on steps 1 through 3 on left side.
   
   
5. Repeat both sides for x2-3 times.