Detect a Squat gesture with kinect

Question

Using the kinect toolbox, detecting simple swipe gestures etc using algorithms such as for detecting a swipe to right gesture:

protected override void LookForGesture()
    {
        // Swipe to right
        if (ScanPositions((p1, p2) => Math.Abs(p2.Y - p1.Y) < SwipeMaximalHeight, // Height
            (p1, p2) => p2.X - p1.X > -0.01f, // Progression to right
            (p1, p2) => Math.Abs(p2.X - p1.X) > SwipeMinimalLength, // Length
            SwipeMininalDuration, SwipeMaximalDuration)) // Duration
        {
            RaiseGestureDetected("SwipeToRight");
            return;
        }

Any ideas on how I can detect a squat, so the hip joint will probably need to be tracked to see if it passes bellow the knee joints 

Or is there any libraries that simulate a squat motion