I love how this site has all these different types of threads
I have been doing Insanity for about eight weeks and I love the results. I can definitely notice a huge difference in not only my looks but my flexibility, jumping ability, and cardio stamina.
I have found that as some others have noted less is more during the workouts. If you need an extra 15 or 20 seconds take it. It adds up to being able to do the next few minutes with much better quality. If you start up too soon you may only get the next 90 seconds in but with the extra 15 second break you will be able to get the next 120-150 seconds of the workout done.
I would have almost completed the workout by now but right during the recovery week I got sick with a horrible cough that took about two weeks to go away. I tried doing the videos before I was completely recovered and the videos just destroyed me! So after about 2 weeks I finally got back into it and it was like I had never done it before.
These videos are great but you have to eat good. And actually the most beneficial thing I have gotten is to eat five times a day the way the book says. I used to never eat breakfast but now I do and then between my breakfast,lunch, and dinners I eat a granola bar or yogurt or something like that. Eating five times a day keeps you fueled. If you eat just a few big meals a day your body doesn't know it will get more nutrients so it stores more food as fat. By eating five times a day you keep the metabolism going and your body burning more calories.
I have even noticed that as long as I eat the five meals a day, I am okay to spoil myself and even eat some fast food for lunch or dinner. But on days where I skip breakfast and the between meal snacks, even if I eat super healthy for my lunch and dinner (salad, small turkey sandwich, etc.) I still don't have as good of results as the days where I eat a bad lunch or dinner but did have my breakfast and between meal snacks.