No matter what program you have, there are many consistent elements to apply. These components will greatly help you along your transformation journey. Compiled below are my keys to success with any of the Beachbody programs.
You will see the greatest changes in your appearance, health, strength, and overall well-being if you stick 100% to your nutrition plan. Whether for the 63 days of Insanity, or for the 90 days of P90X or TurboFire, commit yourself to not cheating on your diet. Say, "No matter what, for 90 days, I won't compromise. Sorry, for the next 90 days, I don't eat those things." It is a commitment that you only make once. Once and it is done. What is there to debate? You don't eat or drink that. Until you are done with you program, you are have one mission and you won't risk messing that up.
Track everything you eat and make sure to weigh/measure your servings. Get a digital kitchen scale and prepackage your servings/meals. Tracking is so easy with programs like myfitnesspal.com. It is totally free and has a huge database of food items, commercial and generic. Just search for what you ate and enter how much you ate. Consistency is key! If you would describe fat loss as your #1 goal, stick to the Fat Shredder percentages. This is where you get your calories from 50% protein, 30% carbohydrates, and 20% fats. The high level of protein helps to keep you satisfied. A whey protein powder makes it much easier to reach your targets. Avoid sugars outside of fruits and other natural sources. If it has high fructose corn syrup in it, don't eat it. Drink your water! No sodas, alcohol, fruit juices, etc... it is too easy to get way off track with all of those. Remember, this is for 90 days; you can reassess your relationship with those other beverages after you are ripped.
Finally, you will be sore. I hadn't worked out in over three years when I started P90X. The first week was rough. I didn't know my chest, arms, back, and legs could ache like that. Get plenty of sleep and keep pushing forward. The soreness means you are pushing your body. It will subside in a couple of weeks.