Slightly conflicting advice with some clear policies see last sentences
from Swim England
"“The guidance we have received is that water and the chlorine within swimming pools will help to kill the virus. It’s important, however, to ensure that everyone visiting pools follows the latest hygiene advice to help reduce the risk of infection.

“Competitors should shower before and after entering the water, while spectators and volunteers should regularly wash their hands for 20 seconds using soap and water or a sanitiser gel.

“Most importantly, if you feel unwell, please do not attend events or training and seek appropriate medical advice.”

from PM-
Anyone who lives with someone who has a cough or a temperature should stay at home for 14 days
People should start working from home where they possibly can
Avoid pubs, clubs, theatres and other such social venues
Only use the NHS when we really need to
From tomorrow government will no longer be “supporting” mass gatherings using emergency workers

My understanding is training can carry on for now- subject to strict showering/washing /self care guidelines. no one will admitted to a training session without a prior shower and also if they have any infection