 Alongside the yoga brands, many teachers, for example in England, offer an unbranded "hatha yoga", often mainly to women, creating their own combinations of poses.These may be in flowing sequences (vinyasas), and new variants of poses are often created.The gender imbalance has sometimes been marked; in Britain in the 1970s, women formed between 70 and 90 per cent of most yoga classes, as well as most of the yoga teachers.