Longest continuous swim in a counter-current pool
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- In February 2014, Chloë McCardel of Australia set the Longest continuous swim in a counter-current pool in 16 hours at the SPASA Victoria consumer Pool & Spa + Outdoor Living Expo in Australia.
- On 25-26 May 2018, Dennis T. Seiler-Holm of Denmark set the Longest continuous swim in a counter-current pool in 17 hours 7 minutes 1.82 seconds in a Swim Spa in Denform Expo in Aarhus, Denmark.
- On 5-6 October 2019, Yuko Matsuzaki of Japan set a Guinness World Record for the Longest continuous swim in a counter-current pool conducted in an Endless Pool in Seaside Lagoon, Redondo Beach, California after swimming 24 hours 1 minute from 8:00 am on 5 October to 8:01 am on 6 October 2019. Her support team included Chris Morgan, Chieko Smith, Shelley Taylor-Smith, Steven Munatones, Josef Köberl, Mark Lutz, Steve Stumpfrock and Kaori Rogers. Her pace ranged from 1:55 per 100 meters swimming freestyle to 3:22 per 100 meters swimming breaststroke.
- On 6-7 May 2020, Pablo Fernández Álvarez of Spain set a Guinness World Record for the Longest continuous swim in a counter-current pool conducted in an Endless Pool in Madrid, Spain after swimming 25 hours from 9:00 am on 6 May to 10:00 am on 7 May 2020.
- Alberto Lorente of Viladecans, Spain set a record for the Longest continuous swim in a counter-current pool after swimming 30 consecutive hours from 11.00 am on 27 June to 5:00 pm on 28 June 2020.
- Mayra Santos of Brazil/Portugal set a world record for the Longest continuous swim in a counter-current pool in Caniço, Madeira Island, Portugal from 10:00 am on 5 November 2020 to 5:07 pm on 6 November 2020, a total of 31 hours 7 minutes.
- Maarten van der Weijden of the Netherlands set a world record of 32 hours 20 minutes 50 seconds for the Longest continuous swim in a counter-current pool in Eindhoven, Netherlands swimming from 9:00 am on 20 November to 5:20 pm on 21 November 2021.
- In November 2021, the Longest continuous swim in a counter-current pool was set in 35 hours 20 minutes 50 seconds.
- On 30-31 January 2022, Pablo Fernández Álvarez of Spain set a Guinness World Record for the Longest continuous swim in a counter-current pool conducted in an Endless Pool in Clicars, Madrid, Spain after swimming 36 hours 0 minutes 19 seconds
- Swimmers may take up to 5 minutes per every 60-minute period to use the restroom, eat, drink, stretch and rest.
- Resting over 5 minutes per hour leads to disqualification.
- Swimmers can split up their 5-minute rest periods per 60 minutes as they wish. For example, they can rest up to 2 minutes in the first hour and then up to 3 minutes in the same hour.
- The maximum 5-minute rest periods cannot be consecutive. For example, you cannot rest for 4 minutes in the last 4 minutes of the first hour and rest another 4 minutes in the first 4 minutes of the second hour.
- Standing up in the pool or hanging on the side of the pool is considered part of the allocated rest period.
- Incidental and accidental touching of the sides or end of the pool - if momentary - are acceptable and is not counted as part of the allocated rest period.
- Any swim stroke can be used (i.e., freestyle, breaststroke, backstroke, butterfly, sidestroke, kicking only).
- Standard swimwear can be used, but no fins, hand paddles, pull buoys, kickboards, snorkels, or wetsuits are to be used.
- Swimming can be performed at any speed. That is, the speed of the counter flow can be reduced. However, the swimmer must continue to swim, albeit at a slow pace if necessary.
- Swimming consists of movement of at least one limb (arm or leg). That is, a swimmer can kick using one or both of their legs only or pull using one or both of their arms only if they wish or if they get tired or sleepy.
- Eating and drinking is permitted while swimming if the swimmer can do so. For example, the swimmer can eat or drink on their back while they are kicking and using one or none of their arms. This is not considered part of their rest period.
- Swimmer must be observed by at least one observer (witness) at all times. However, solo lengthy shifts over 4 hours by one observer are not recommended. For observation purposes and for the swimmer's safety, it is recommended that a minimum of two observers take short shifts to monitor the swimmer at all times.
- The observers should monitor and document in writing all major events during the attempt (e.g., time and duration of the rest periods, the start and finish times, the type of swimming stroke used and when, the number of arm strokes per minute periodically recorded, the types of food and drink consumed and when, the location of attempt, the names and contact information of key volunteers, observers, and staff).
- It is strongly encouraged to have the swim videotaped and preferably livestreamed and posted on social media.
- Swimmers can adjust the speed of the countercurrent as they wish. That is, if they get tired, they can reduce the speed of the countercurrent.
Yuko Matsuzaki Guinness World Record
Produced by Kristen Stephenson of Guinness World Records
At the 24-hour mark in the Seaside Lagoon in Redondo Beach, California.
At the 16-hour mark in the Seaside Lagoon in Redondo Beach, California.
Dennis T. Seiler-Holm World Record
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