The government has today updated the Covid-safety guidance for ‘Providers of grassroots sport and gym/leisure facilities’ around ‘keeping your customers and users of sports and gym/leisure facilities safe (section 2), social distancing (section 4), changing rooms and showers (section 6.4), and cars, accommodation and visits (section 8)’.
You can find the updated guidance here: https://www.gov.uk/guidance/working-safely-during-coronavirus-covid-19/providers-of-grassroots-sport-and-gym-leisure-facilities
The guidance is to be read alongside the tier 3 restrictions https://www.gov.uk/guidance/local-covid-alert-levels-what-you-need-to-know