@ignacioarreses, These yoga books included most important knowledge of Yoga system. More Indian yogis doing fasting process for give break their stomach. They believe their spiritual life most.
Also every Muslims doing fasting some period every year. Actually fasting given big mind controlling level. So fasting wanna big movement of our life. Those days I did fasting activity every single day. I feel I had more freedom that time. Thanks for sharing your continuous practicing thing to Dtube community.