The nice thing about p90x is that if you do other things like walking, house work, visit the gym no and then, it is a great substitute for the days you want to workout at home. YOu don't need to follow it exactly to see results! Only if you want the results you think they are talking about! Remember much of all of this is in you mind also. Eat right and be happy with what you have, get some movement and things will change. I use p90x on the days when I can't leave my room.. when it is blowing 90MPH and you can't see 20 feet. Or when it is -35 for weeks on end ..LOL. ANyway I use it when I want and skip to the parts I really don't like. I have learned the routines so I can do something else while they do something I am not good at or am restricted by space in my room. So mostly pushups, and band work. I also use a rebounder! Which is less stressful on my knees.
Good Luck!
Dave
Living the dream, inside a myth