Always start with the draw-in a.k.a tightening before starting the movement of the knee bent or straight leg (whichever one you choose)
The object is to keep your draw-in while you are raising and lowering the leg.
I perform this exercise 2 sets of 5-8 reps
**IT IS HIGHLY SUGGESTED FOR MOTHERS JUST STARTING THESE PROGRESSION CORE EXERCIES TO USE A TOWEL TO APPROXIMATE THEIR ABDOMINAL WALL WHILE GOING THROUGH THE EXERCISES. AS IMPROVEMENT IS MADE/NOTICED, THATS WHEN THE TOWEL CAN START BEING WEANED OFF AND USING YOUR HAND FOR APPROXIMATION.