Every religion I know has some kind of fasting , pilgrimage , chanting, doing good karma is prescribed. Before going on any big trip, Yatra , jatra , journey whatever you call it’s a good idea to fast or take laxative.
One can read a big book on fasting and discuss , argue over it or just fast for a day and you will know what fast is. Same rule applies to lot of other things. If anything appeals to you, experiment with it be it yoga , meditation, pilgrimage or whatever it is. Theory without experiment is useless.