Although active range of motion exercises are supposedly among the easiest form of exercises to do, being consistent with these one as you fight the invisible foe of gravity will be tough. You start with 2 sets of 5 and build to 2 sets of 15 per leg. I love to teach just moving the hip up about this high, too much and you can irritate the hip joint. You can experiment as you get good by doing short motions from this high in bringing the foot forward and backward to the other leg as a reference. Stop if there is any hip or back soreness.