As unlikely as it sounds, converts of 'AntiGravity Yoga' say the technique enables them to reach positions other exercises can't reach, leading to a better all-round work-out. Participants use a hammock suspended from the ceiling to carry out yoga, pilates and dance moves while defying gravity. It is becoming more and more popular in America and fitness experts believe it is only a matter of time before it 'takes off' here. Crunch, a US gym chain, has been pioneering AntiGravity Yoga with its one-hour sessions, which it has nick-named 'Wings'.