The swimming event that includes the individual medley is known as the IM(Individual Medley), which involves a combination of four different strokes: butterfly, backstroke, breaststroke, and freestyle. Swimmers must perform each stroke over designated distances within a single race. This event tests an athlete's versatility and endurance, highlighting their ability to transition smoothly between different techniques. The IM is often considered one of the most challenging events in competitive swimming due to the skill set required to excel.