Quadruple Pirouettes - Tip from Pointe Magazine
The first step towards mastering a quadruple turn is having a clean, consistent triple pirouette under your belt. (If you don't, work on that first.) From there, figure out how much force you need to add a rotation without losing control. This will require some trial and error, and it may be much less than you think. As with any pirouette, you need to have solid core and upper back muscles, so that you can turn in one piece; I find that plank exercises help strengthen these areas. Practice balancing in passé, too, pulling up high into the supporting hip as you push down into the floor. And as you spot, try not to tense up. Keep your neck relaxed...