I have only jsut completed Week #1 of Insanity. I can definatly tell a difference in stamina and length of time in which I can stay at the fastest level. My question is for those who have had a dificult time doing it every single day. I work nights shift and so alot of times its hard for me to keep up with it every day. Its usually like three or four days in a row then miss one. Is that ok? What should I do to prevent that or make up for it.