When do I lose a point in wheelchair tennis?

On top of the normal ways of losing a point under the Rules of Tennis, a wheelchair player loses the point if they:

1. Fail to return the ball before it bounces a third time;
2. Use any part of their feet or lower limbs (buttocks, hips, thighs, legs, ankles or feet) against the ground or a wheel while serving, hitting the ball, turning or stopping during a point (except a player permitted to push with one foot, under the foot rules); or
3. Fail to keep one buttock in contact with the seat when hitting the ball.