In Hinduism, the fasting is known as Vrat or Vratam and Upavas. There are several fasting suggested for happy and peaceful life. In current time, Ekadashi, Pradosh and Sankashti are more prevalent and popular fasting among followers of Hinduism.
Ekadashi Upavas is dedicated to Lord Vishnu. Lord Vishnu is the preserver of the life and Ekadashi fasting is suggested and mostly people do for long life, good health and getting rid of the cycle of birth and the death i.e. to attain Moksha. Pradosh Upavas fasting is dedicated to Lord Shiva. Pradosh fasting is suggested and mostly people do to get a compatible life partner, marital bliss, sexual satisfaction and fulfillment in the life. Sankashti Upavas fasting is dedicated to Lord Ganesha. Sankashti fasting is suggested to get rid of obstacles in life and mostly people do to get the difficult work done successfully without any obstructions and impediments.
Ekadashi Vrat and Pradosh Vrat are observed two times in the month while Sankashti Vrat is observed once every month as per Hindu calendar.
Many people observe Ekadashi Vrat as well as Pradosh Vrat. Usually there is a gap of single day between Ekadashi and Pradosh fasting. However, many times they are observed on two consecutive days. Many devotees want to know how to break Ekadashi fast on the next day when Pradosh is getting observed on the same day. It is suggested to do symbolic Ekadashi Parana with only water and continue the Pradosh without actually breaking the fast. Although seems difficult but it is quite normal in Hinduism to fast on two consecutive days.