I love this one, but it requires some glute strength. Stack the body in all one line - as if you are wedged between two panes of glass. Or as I like to say, you are the cream filling in the Oreo cookie!

Raising the leg to hip height is ideal, but as Katies shares here- it ain't happening! So find the level that works for you.

As with the Side Kick (Lying), you try to keep your body stable as the leg moves forward and back.

If it is too difficult to place your hand behind your head (often because of tight pecs or lats), then the fingertips can come to the forehead instead.

Practice Practice Practice.