Lying on your side with your elbow under your shoulder and your knees bent at an angle lift up onto your elbow to get yourself into a side plank postion keep your head in line with spine etc.
Now lift and lower your hip to ground and back up as part one of exercise. Once they have got this movement you can add on as you lift hip up to ceiling you lift top leg up as well, and as you lower hip to floor you lower top leg. This then adds a little bit of intensity to a normal side plank.
Hope you can use this!!!