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noun - Relay swim is a non-stop swim performed by a group of swimmers who swim separately one after each other. The relay swimmers swim legs of anywhere from 10 - 60 minutes each, usually rotating in the same order. Relay swims usually refer to a channel crossing or marathon swim across a channel, lake or bay or in a river done by a group of swimmers ranging from 2 - 8 individuals escorted by a boat, pilot and support crew. It is different from a solo swim that is performed by a single individual.
The athletes were preparing for their longest relay swim yet by training four days a day.
The observer reports include the following: