I think the "90 day" thing is just a guide. The idea behind it is to structure a fitness plan that is set out nice and simply, so all people have to do is put in the DVD and press play. It's the closest we at home can get to a personal trainer setting up a 3 month routine for us! I've seen people call these 90 day scheduled programs "gimmicky", but I do think that people genuinely like the simplicity of not having to plan their workouts.

I think Jillian's ultimate goal is to keep people moving, and hopefully settle into a permanent exercise routine. As long as you're not over/underworking certain muscle groups, I say go for it! (I know P90X lets you repeat weeks a certain number of times if you don't feel up to moving on, so I don't see that this would be much different.) I think as long as you're increasing the intensity with your ability (as you said, increasing weights, modified moves, etc) then you'll probably see results.

I'm nowhere near the end but I'm already thinking about what I might do when I finish this - I don't want to get to the end of week 12 and lose any progress I've made... I personally wish she'd release another 90 day program of what to do next, or maintenance or something, but she's back on Biggest Loser now and has those two young children, so I won't hold my breath for it... :P

I missed a few days of 3&4 so I repeated. I am thinking of even doing another week due to how sore I still get. I just have a lot of trouble on push-ups and plank moves. But, I am eager to start number 5&6! I always say the "90 days" is a gimmick. I always think about the movie "there's something about Mary" when they talk about "7 minutes abs" instead of "8 minute abs". If JMBR said it was a 120 day work out, people would want p90 or insanity because it is only 90 days and I will be perfect! Do it regularly and repeat- as long as you are working hard and committing to it, who cares how long it takes!

I will be over the 90 days, partially because I repeated 1&2 for a week and 3&4 for a week after I first finished Phase 1 and partially because I fell behind a little last weekend. However, I decided from now on I would just keep modifying and pushing through to the end because it's so much more interesting to switch up the workouts and challenge myself more. Once I finish, I will probably start over from the beginning using heavier weights and (hopefully) less modifications. Workout 7 is killer with the push-ups!!