Butterfly (the stroke with the double-arms-forward motion paired with a dolphin kick on your front) is the first stroke swum in a swimming medley called "Individual Medley." In a swimming medley relay, however, backstroke is performed first as it is the only stroke that requires a start in water, while all other strokes start off with a dive.
Swimming A "medley" is an event in competitive swimming in which backstroke, breaststroke, butterfly, and freestyle are swum in equal distances by an individual or as divisions of a relay race.
when you are doing breast stroke is there any rules
Some people call it the front crawl. Most people call it Freestyle. It is generally the fastest stroke which is swum on your stomach.
Backstroke or back crawl is one of the four swimming styles used in competitive events regulated by FINA, and the only one of these styles swum on the back. This swimming style has the advantage of easy breathing, but the disadvantage of swimmers not being able to see where they are going. It also has a different start from the other three competition swimming styles. The swimming style is similar to an upside down front crawl or freestyle. Both backstroke and front crawl are long-axis strokes. In individual medley backstroke is the second style swum; in the medley relay it is the first style swum.
will have swum
It must be used after some form of have. He/she/it (has) swum. We/You/they (have) swum. Or having, as in: Having swum the length of the pool....
swum as in I have swum the channel
will have swum is the verb phrase.
Swum is the past participle of the verb "swim".
swum as in I have swum the channel
"You have just swum" is correct. "Swam" is the past tense, while "swum" is the past participle form of the verb "swim."