Monica Linford uses small flexible balls as part of a fitness routine. The aim is not only to use exercise to promote postural fitness but also to move chi (or vital energy) around the body. Her system is based on the Chinese idea of yin and yang and she advocates a different sort of exercise for different needs at different times of year. Her method is comprised of 5 elements: Tai Chi and Chi Kung (the Chinese model which uses repetitive flowing movements to improve circulation, concentration and co-ordination); Yoga (for strength, stamina and flexibility); Pilates (to build awareness and stabilise your torso); Feldenkreis method (to return to basics and rediscover the flexibility and movement of childhood); and meditation and deep relaxation.