A medley in swimming is a race that combines all four competitive strokes into a single event. Each stroke covers exactly one quarter of the total distance, and the strokes must be swum in a specific order. There are two types: the individual medley (IM), where one swimmer completes all four strokes, and the medley relay, where four swimmers each take one stroke. The stroke order differs between the two.
Stroke Order in the Individual Medley
In the individual medley, a single swimmer covers all four strokes in this order: butterfly, backstroke, breaststroke, then freestyle. So in a 200m IM, each stroke covers 50 meters. In a 400m IM, each covers 100 meters.
The order is fixed by international swimming rules and never changes. A swimmer who mixes up the sequence is immediately disqualified. The logic behind the order is partly practical: backstroke is the only stroke started in the water (rather than off the blocks), so it’s placed second, allowing the swimmer to push off the wall onto their back after the butterfly leg rather than needing a dive start.
How the Medley Relay Differs
The medley relay uses the same four strokes but in a different order: backstroke, breaststroke, butterfly, then freestyle. The reason for the change is simple. Backstroke is the only stroke that requires an in-water start, so it goes first. That way, the backstroke swimmer can begin the race from the wall like they would in an individual backstroke event, and every swimmer after that dives in from the blocks.
Each relay team has four swimmers, and each person swims one full leg. In the mixed medley relay, which debuted at the 2013 World Championships in Barcelona, the team must include two men and two women. There’s no restriction on which swimmer takes which stroke, so coaches can arrange the gender order strategically to maximize their team’s speed.
What “Freestyle” Actually Means in a Medley
This is one of the most misunderstood parts of medley racing. In the freestyle leg, you can technically swim any stroke, but you cannot repeat butterfly, backstroke, or breaststroke because those strokes have already been used. In practice, every competitive swimmer uses front crawl for the freestyle portion since it’s the fastest stroke available.
The rules are strict about this distinction. If you push off the wall for the freestyle leg and end up on your back while moving through the water, even briefly to fix your goggles, officials will disqualify you. Being on your back and moving forward counts as swimming backstroke, which means you’ve covered more than one quarter of the race in that style. It doesn’t matter why you rolled over.
Common Ways Swimmers Get Disqualified
Medley events carry a higher disqualification risk than single-stroke races because swimmers must follow the technical rules for all four strokes in one race. The most common violations fall into a few categories.
- Illegal wall touches: During the butterfly and breaststroke legs, both hands must touch the wall simultaneously at every turn and at the transition to the next stroke. Rushing the turn and making contact with one hand before the other is one of the most frequent disqualifications in swimming.
- Wrong stroke order: Swimming the strokes out of sequence results in an automatic disqualification. This is rare at elite levels but happens in age-group competitions.
- Early transitions: A swimmer must fully complete the current stroke before transitioning to the next one. Starting freestyle arm movements before finishing the breaststroke leg, for example, is a violation.
- Mixing techniques between strokes: Using a flutter kick during the breaststroke leg or alternating arms during butterfly will draw a disqualification. Each stroke has its own required body mechanics, and they can’t bleed into each other.
- Breaststroke underwater violations: After each turn in the breaststroke leg, swimmers are allowed only one arm pull and one dolphin kick while submerged. Taking an extra pull-down is a disqualification.
Medley Distances and Olympic Events
The two standard individual medley distances are 200m and 400m. Both are contested at the Olympics, World Championships, and most competitive levels down to age-group swimming. The 400m IM has been an Olympic event since the 1964 Tokyo Games. The 200m IM was introduced in 1968 and 1972, dropped for two Olympic cycles, then returned permanently in 1984.
The 4x100m medley relay has long been a staple of major competitions. The mixed 4x100m medley relay was added more recently, giving teams the tactical puzzle of deciding which men and women swim which strokes. Short course competitions (25m pools) also feature 100m individual medley events, where each stroke covers just 25 meters, making transitions happen rapidly.
Why the IM Is Considered Swimming’s Toughest Event
The individual medley demands proficiency in all four strokes, which is why IM specialists are often considered the most well-rounded swimmers in the sport. Most swimmers have a weaker stroke, and the IM exposes it. A strong butterflyer who struggles with breaststroke can build a lead in the first 50 meters and watch it evaporate in the third leg.
The 400m IM is particularly grueling because it combines the endurance demands of a 400m race with the technical complexity of four stroke transitions. Pacing is critical: going out too hard on butterfly, the most energy-expensive stroke, can leave a swimmer with nothing left for the freestyle finish. The best IM swimmers balance speed across all four legs rather than relying on dominance in one.