The 21 Day Fix is a popular fitness and nutrition program designed to help individuals lose weight and develop healthier habits in just three weeks. It combines simple portion control with a variety of workout routines, making it accessible for people of all fitness levels. The program includes color-coded containers for measuring food portions, ensuring balanced nutrition without the need for complicated calorie counting. Participants follow a structured schedule that includes daily workouts and meal plans. The workouts are typically 30 minutes long and cover different exercise styles, such as strength training and cardio. Overall, the 21 Day Fix aims to promote sustainable lifestyle changes through its straightforward approach to fitness and nutrition.