Longest continuous swim in a counter-current pool

From Openwaterpedia

The Longest Continuous Swim in a Counter-current Pool (or the Longest continual swim in a counter-current pool) is a solo swim conducted in an Endless Pool or swim spa.

World Records for Continuous Swims in a Counter-current Pool


The World Open Water Swimming Association (WOWSA) rules that govern attempts of continuous swims in a counter-current pool are as follows:

  • 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 finshand paddlespull buoyskickboards, 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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