This documentary reflects the enthusiasm created for ultimate fighting, also known as free fightings, where opponents can use several techniques from different martial arts. For a long time prohibited, there was few galas, offering amateurs or professionals. Since then, an increasing number of different leagues were gathered to organize them. These controversial fights gained in popularity both among those who practice than the spectators. This documentary presents amateurs and professionals in training or in combat explaining their motivations and their gait.