This exercise is intended to increase the intensity of the abdominal work while maintaining the differentiation of movement from the hip and the pelvis
To do this exercise you will need a mat. Start by lying on your back with your legs in a tabletop position. Inhale to prepare and then exhale as you lower your legs to tap your toes on the ground and then return them to tabletop. Inhale in between and then exhale as you repeat the movement. Repeat 8-10 times
Things to think about
It is important to use the low abdominals to support the pelvis while the lever arm of the legs is lowering.
Also be sure that as you exhale you are narrowing your ribcage towards the spine so that it is grounded into the mat and allows the muscles of the back to remain soft.
Be sure to maintain the angle at the knees to ensure that the thighs are arcing and not just the lower legs.