The general idea is that you do a 30 minute workout every day, and based on your calorie intake (math included) you are allowed a certain number of containers every day- Veggies, Fruits, Protein, Carbs, Healthy fats and oils. It's pretty flexible and it's a TON of food.
Right now I'm on Day 14- Two weeks in. I've lost 7 pounds and I can definitely see a change in my body and even in my cravings and eating habits. It's been hard, but that's why they call it a challenge. I'm happy with the results I'm seeing so far, especially since it's only been 2 weeks!!
If you want more information about the 21 Day Fix or just eating clean in general, please let me know and I can put you in contact with my sister!