Backstroke image: Wood, Ryan. “4 Drills for Backstroke Beginners.” ACTIVE.com, Active.com, 27 Nov. 2017, https://www.active.com/swimming/articles/4-drills-for-backstroke-beginners.
Breastroke image: Mullen, G. John. “Olympic Breaststroke Technique.” Stack, 27 Sept. 2012, https://www.stack.com/a/olympic-breaststroke-techniques/.
Butterfly image: Keller, Christophe. “Swimming Technique of the Butterfly Stroke.” Enjoy Swimming, 31 Jan. 2022, https://www.enjoy-swimming.com/butterfly-stroke.html.
Breastroke image: Mullen, G. John. “Olympic Breaststroke Technique.” Stack, 27 Sept. 2012, https://www.stack.com/a/olympic-breaststroke-techniques/.
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