Xing Yi Quan
Despite its hard, angular appearance, cultivating "soft" internal strength is essential to achieving power in Xing Yi Quan. Also, the advanced practitioner always contains tight spirals within his movements, so even the seemingly direct and linear ones are circular on a very small scale. Such circles and spirals also exist in other martial arts, but Xing Yi (like Southern Praying Mantis) likes to keep them smaller than others.