The 'Ekadasi' Sites

Sites on:

Glorious Ekadasi

http://www.goloka.com/docs/calendar/ekadasi.html

http://www.acbspn.com/ekadashis/ekadashis.htm
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[Sri Joyan]

Hello, my name is Joyan. this is my first post =) I dont really understand these rituals and restrictions. What is the reasoning for it? What is supposed to happen if you dont follow them?