Insanity is a 12-week fitness program that consists of 13 workout videos, each approximately 30-45 minutes long. The program is designed to be completed at home, with no special equipment required. The workouts are intense, with a focus on bodyweight exercises, plyometrics, and cardio exercises. The program's creator, Shaun T, is a well-known fitness expert and motivational speaker who has worked with celebrities and athletes.